T-Mobile Q2 2025 Financial Metrics Overview

T-Mobile Q2 2025 Financial Metrics Overview

• 1. EXHIBIT 99.2

• 2. 3 Highlights 4 Customer Metrics 7 Financial Metrics 13 Capital Structure 14 Guidance 15 Contacts 16 Financial and Operational Tables 2

• 3. (1) AT&T Inc. does not disclose postpaid net account additions. Comcast and Charter do not disclose postpaid phone net customer additions. Industry-leading claims are based on consensus expectations if results are not yet reported. (2) Core Adjusted EBITDA, Adjusted Free Cash Flow and Adjusted Free Cash Flow Margin are non-GAAP financial measures. These non-GAAP financial measures should be considered in addition to, but not as a substitute for, the information provided in accordance with GAAP. Reconciliations for these non-GAAP financial measures to the most directly comparable GAAP financial measures are provided in the Reconciliation of Non-GAAP Financial Measures to GAAP Financial Measures tables. We are not able to forecast Net income on a forward-looking basis without unreasonable efforts due to the high variability and difficulty in predicting certain items that affect Net income, including, but not limited to, Income tax expense and Interest expense. Core Adjusted EBITDA should not be used to predict Net income as the difference between this measure and Net income is variable. (3) Effective November 1, 2024, following amendments to the company’s Equipment Installment Plan Sale and Service Receivable Sale arrangements, all cash proceeds associated with the sale of such receivables, a portion of which was previously recognized as Proceeds related to beneficial interests in securitization transactions within investing cash flows, were recognized as operating cash flows. These amendments did not have a net impact on Adjusted Free Cash Flow. 3

• 4. Postpaid Accounts (in thousands) 301 315 263 205 318 30,316 30,631 30,894 31,099 31,502 Postpaid net account additions Postpaid accounts Q2 2024 Q3 2024 Q4 2024 Q1 2025 Q2 2025 During Q2 2025, we acquired 85,000 postpaid accounts from Lumos. Year-Over-Year Continued growth in Postpaid accounts with an increase in net additions primarily due to: ■ Higher gross account additions ■ Partially offset by higher account deactivations, including the impact from a growing account base and the temporary impact of current year rate plan optimizations, and lower 5G broadband-only additions Sequential Continued growth in Postpaid accounts with an increase in net additions primarily due to: ■ Higher gross account additions Year-Over-Year Postpaid ARPA increased 5% primarily due to: ■ The positive impact from rate plan optimizations and higher fee revenue, including from the adoption of new tax and fee exclusive plans ■ An increase in customers per account, including from the continued adoption of 5G broadband and continued growth of T-Mobile for Business customers ■ Higher premium services, primarily high-end rate plans, net of contra revenues for content included in such plans, and discounts for specific affinity groups (55+, military, and first responders) ■ Partially offset by increased promotional activity and an increase in 5G broadband and fiber-only accounts Postpaid phone ARPU increased 3% due to: ■ The positive impact from rate plan optimizations and higher fee revenue, including from the adoption of new tax and fee exclusive plans ■ Higher premium services, primarily high-end rate plans, net of contra revenues for content included in such plans, and discounts for specific affinity groups (55+, military, and first responders) ■ Partially offset by increased promotional activity, including the success of bundled offerings and continued growth in T-Mobile for Business customers with lower ARPU given larger account sizes Sequential Postpaid ARPA increased 2% due to: ■ The positive impact from rate plan optimizations and higher fee revenue, including from the adoption of new tax and fee exclusive plans ■ An increase in customers per account, including from the continued adoption of 5G broadband Sequential ■ Higher premium services, primarily high-end rate plans, net of contra revenues for content included in such plans, and discounts for specific affinity groups (55+, military, and first responders) ■ Partially offset by increased promotional activity and an increase in 5G broadband and fiber-only accounts Postpaid phone ARPU increased 3% due to: ■ The positive impact from rate plan optimizations and higher fee revenue, including from the adoption of new tax and fee exclusive plans ■ Higher premium services, primarily high-end rate plans, net of contra revenues for content included in such plans, and discounts for specific affinity groups (55+, military, and first responders) ■ Partially offset by increased promotional activity, including the success of bundled offerings Postpaid ARPA & Postpaid Phone ARPU $142.54 $145.60 $146.28 $146.22 $149.87 $49.07 $49.79 $49.73 $49.38 $50.62 Postpaid ARPA Postpaid Phone ARPU Q2 2024 Q3 2024 Q4 2024 Q1 2025 Q2 2025 4

• 5. Postpaid Customers (in thousands) 1,338 1,575 1,933 1,337 1,732 777 865 903 495 830 561 710 1,030 842 902 100,610 102,185 104,118 105,455 107,284 Postpaid phone net customer additions Postpaid other net customer additions Total postpaid customers Q2 2024 Q3 2024 Q4 2024 Q1 2025 Q2 2025 During Q2 2025, we acquired 97,000 postpaid fiber customers from Lumos. Year-Over-Year Postpaid phone net customer additions increased primarily due to: ■ Higher gross additions ■ Higher prepaid to postpaid migrations ■ Partially offset by higher churn, primarily driven by the temporary impact of current year rate plan optimizations and increased deactivations from a growing customer base Postpaid other net customer additions increased primarily due to: ■ Higher net additions from mobile internet devices, primarily due to higher prior year deactivations of lower ARPU mobile internet devices in the educational sector activated during the Pandemic and no longer needed ■ Higher 5G broadband net additions ■ Partially offset by increased deactivations from a growing customer base, as well as lower net additions from wearables Sequential Postpaid phone net customer additions increased primarily due to: ■ Higher gross additions and slightly lower churn, despite the temporary impact of current year rate plan optimizations ■ Higher prepaid to postpaid migrations Postpaid other net customer additions increased primarily due to: ■ Higher net additions from mobile internet devices and wearables ■ Higher 5G broadband net additions ■ Partially offset by lower net additions from other connected devices Year-Over-Year Postpaid phone churn increased 10 basis points primarily due to: ■ The temporary impact of current year rate plan optimizations Sequential Postpaid phone churn decreased 1 basis point primarily due to: ■ Seasonally lower switching activity ■ Mostly offset by the temporary impact of current year rate plan optimizations Postpaid Phone Churn 0.80% 0.86% 0.92% 0.91% 0.90% Q2 2024 Q3 2024 Q4 2024 Q1 2025 Q2 2025 5

• 6. Prepaid Customers (in thousands) 179 24 103 45 39 25,283 25,307 25,410 25,455 25,494 Prepaid net customer additions Prepaid customers Q2 2024 Q3 2024 Q4 2024 Q1 2025 Q2 2025 During Q2 2024, we acquired 3.5 million prepaid customers, net of certain base adjustments, through the Ka’ena Acquisition. Year-Over-Year Prepaid net customer additions decreased primarily due to: ■ Increased deactivations from a growing customer base, primarily due to the acquisition of Ka’ena Corporation, including its subsidiary brands Mint Mobile and Ultra Mobile in May 2024 (the “Ka’ena Acquisition”) ■ Higher churn ■ Higher prepaid to postpaid migrations ■ Partially offset by higher gross additions, primarily due to the Ka’ena Acquisition Sequential Prepaid net customer additions decreased slightly primarily due to: ■ Higher prepaid to postpaid migrations ■ Partially offset by higher gross additions Year-Over-Year 5G broadband net customer additions increased primarily due to: ■ Higher gross additions ■ Lower churn ■ Partially offset by increased deactivations from a growing customer base Sequential 5G broadband net customer additions increased primarily due to: ■ Higher gross additions ■ Lower churn ■ Partially offset by increased deactivations from a growing customer base 5G Broadband Customers (in thousands) 406 415 428 424 454 358 385 365 387 427 5,587 6,002 6,430 6,854 7,308 Postpaid 5G broadband net customer additions Prepaid 5G broadband net customer additions 5G broadband customers Q2 2024 Q3 2024 Q4 2024 Q1 2025 Q2 2025 6

• 7. Service Revenues ($ in millions) $16,429 $16,725 $16,928 $16,925 $17,438 Q2 2024 Q3 2024 Q4 2024 Q1 2025 Q2 2025 Year-Over-Year Service revenues increased 6% primarily due to: ■ An increase in Postpaid service revenues ■ Partially offset by a decrease in Wholesale and other service revenues, primarily driven by lower MVNO revenues, including lower DISH and TracFone MVNO revenues, and lower Affordable Connectivity Program revenues Sequential Service revenues increased 3% primarily due to: ■ An increase in Postpaid service revenues Year-Over-Year Postpaid service revenues increased 9% primarily due to: ■ Higher postpaid ARPA ■ Higher average postpaid accounts Sequential Postpaid service revenues increased 4% primarily due to: ■ Higher postpaid ARPA ■ Higher average postpaid accounts Postpaid Service Revenues ($ in millions) $12,899 $13,308 $13,502 $13,594 $14,078 Q2 2024 Q3 2024 Q4 2024 Q1 2025 Q2 2025 7

• 8. Equipment Revenues ($ in millions) $3,106 $3,207 $4,699 $3,704 $3,439 $3,080 $3,186 $4,688 $3,703 $3,433 Equipment sales Lease revenues Q2 2024 Q3 2024 Q4 2024 Q1 2025 Q2 2025 Year-Over-Year Equipment revenues increased 11% primarily due to: ■ A higher average revenue per device sold, net of promotions, primarily driven by an increase in the highend phone mix, including from higher postpaid device upgrades and lower Assurance Wireless device sales ■ Higher liquidation revenue, primarily due to a higher number of liquidated devices Sequential Equipment revenues decreased 7% primarily due to: ■ A lower average revenue per device sold, net of promotions, primarily due to a decrease in the high-end phone mix Year-Over-Year Cost of equipment sales, exclusive of Depreciation and Amortization (D&A), increased 14% primarily due to: ■ A higher average cost per device sold, primarily driven by an increase in the high-end phone mix, including from higher postpaid device upgrades and lower Assurance Wireless device sales ■ Higher liquidation costs, primarily due to a higher number of liquidated devices Sequential Cost of equipment sales, exclusive of D&A, decreased 3% primarily due to: ■ A lower average cost per device sold, primarily due to a decrease in the high-end phone mix Cost of Equipment Sales, exclusive of D&A ($ in millions, % of Equipment sales) $4,088 $4,307 $6,088 $4,798 $4,659 132.7% 135.2% 129.9% 129.6% 135.7% Q2 2024 Q3 2024 Q4 2024 Q1 2025 Q2 2025 8

• 9. Cost of Services, exclusive of D&A ($ in millions, % of Service revenues) $2,664 $2,722 $2,697 $2,602 $2,717 $2,591 $2,655 $2,622 $2,582 $2,689 15.8% 15.9% 15.5% 15.3% 15.4% Cost of services, ex. D&A and Special Items Sprint Merger-related costs Other Special Items % of Srvc revs, ex. D&A and Special Items Q2 2024 Q3 2024 Q4 2024 Q1 2025 Q2 2025 Year-Over-Year Cost of services, exclusive of D&A, increased 2% primarily due to: ■ Higher site costs associated with the continued build-out of our nationwide 5G network ■ Partially offset by prior year Sprint Merger-related costs related to network decommissioning and integration Sequential Cost of services, exclusive of D&A, increased 4% primarily due to: ■ Numerous immaterial factors, including seasonality and the impact of acquisitions Year-Over-Year SG&A expense increased 5% primarily due to: ■ Higher payroll and benefit related expenses, including from the impact of acquisitions ■ Higher advertising expenses ■ A $100 million gain recognized in the prior year period for the extension fee previously paid by DISH pursuant to the license purchase agreement for 800 MHz spectrum, which was not purchased ■ Partially offset by a $151 million gain in Q2 2025 related to the completed sale of a portion of our 3.45 GHz spectrum licenses Sequential SG&A expense decreased 2% primarily due to: ■ A $151 million gain in Q2 2025 related to the completed sale of a portion of our 3.45 GHz spectrum licenses Selling, General and Administrative (SG&A) Expense ($ in millions, % of Service revenues) $5,142 $5,186 $5,352 $5,488 $5,397 $5,187 $5,100 $5,402 $5,415 $5,415 31.6% 30.5% 31.9% 32.0% 31.1% SG&A expense, ex. Special Items Sprint Merger-related costs (gain), net Other Special Items % of Srvc revs, ex. Special Items Q2 2024 Q3 2024 Q4 2024 Q1 2025 Q2 2025 9

• 10. Net Income ($ in millions, % of Service revenues) $2,925 $3,059 $2,981 $2,953 $3,222 17.8% 18.3% 17.6% 17.4% 18.5% Q2 2024 Q3 2024 Q4 2024 Q1 2025 Q2 2025 Diluted Earnings Per Share (Diluted EPS) $2.49 $2.61 $2.57 $2.58 $2.84 Q2 2024 Q3 2024 Q4 2024 Q1 2025 Q2 2025 Year-Over-Year Net income was $3.2 billion and Diluted earnings per share was $2.84 in Q2 2025, compared to $2.9 billion and $2.49 in Q2 2024, primarily due to the factors described above. Sequential Net income was $3.2 billion and Diluted earnings per share was $2.84 in Q2 2025, compared to $3.0 billion and $2.58 in Q1 2025, primarily due to the factors described above. 10

• 11. Core Adjusted EBITDA* ($ in millions, % of Service revenues) $8,027 $8,222 $7,905 $8,258 $8,541 48.9% 49.2% 46.7% 48.8% 49.0% Q2 2024 Q3 2024 Q4 2024 Q1 2025 Q2 2025 *Excludes Special Items (see detail on page 24) Year-Over-Year Core Adjusted EBITDA increased 6% primarily due to: ■ Higher Total service revenues ■ Higher Equipment revenues, excluding Lease revenues ■ Partially offset by higher Cost of equipment sales, and higher SG&A expenses and Cost of services, excluding Special Items Sequential Core Adjusted EBITDA increased 3% primarily due to: ■ Higher Total service revenues ■ Lower Cost of equipment sales ■ Partially offset by lower Equipment revenues, excluding Lease revenues, and higher Cost of services, excluding Special Items Year-Over-Year Net cash provided by operating activities increased 27% primarily due to: ■ Lower net cash outflows from changes in working capital, including the impact of certain cash proceeds associated with the sale of receivables, which were recognized within investing cash flows before November 1, 2024 ■ Higher Net income, adjusted for non-cash income and expenses Sequential Net cash provided by operating activities increased 2% primarily due to: ■ Lower net cash outflows from changes in working capital The impact of net payments for Sprint Merger-related costs on Net cash provided by operating activities was $61 million in Q2 2025 compared to $61 million in Q1 2025 and $241 million in Q2 2024. Net Cash Provided by Operating Activities ($ in millions) $5,521 $6,139 $5,549 $6,847 $6,992 Q2 2024 Q3 2024 Q4 2024 Q1 2025 Q2 2025 Effective November 1, 2024, following amendments to the company’s Equipment Installment Plan Sale and Service Receivable Sale arrangements, all cash proceeds associated with the sale of such receivables, a portion of which was previously recognized as Proceeds related to beneficial interests in securitization transactions within investing cash flows, were recognized as operating cash flows. These amendments did not have a net impact on Adjusted Free Cash Flow. 11

• 12. Cash Purchases of Property and Equipment, incl. Capitalized Interest ($ in millions, % of Service revenues) $2,040 $1,961 $2,212 $2,451 $2,396 12.4% 11.7% 13.1% 14.5% 13.7% Q2 2024 Q3 2024 Q4 2024 Q1 2025 Q2 2025 Year-Over-Year Cash purchases of property and equipment, including capitalized interest, increased 17% primarily due to: ■ Planned timing of capital purchases Sequential Cash purchases of property and equipment, including capitalized interest, decreased 2% primarily due to: ■ Planned timing of capital purchases Year-Over-Year Adjusted Free Cash Flow increased 4% primarily due to: ■ Higher Net cash provided by operating activities ■ Partially offset by proceeds related to securitization transactions recognized prior to November 1, 2024, and higher Cash purchases of property and equipment All cash proceeds from the sale of receivables are now recognized within Net cash provided by operating activities. There were no significant net cash impacts during the quarter from securitization. Sequential Adjusted Free Cash Flow increased 5% primarily due to: ■ Higher Net cash provided by operating activities The impact of net payments for Sprint Merger-related costs on Adjusted Free Cash Flow was $61 million in Q2 2025 compared to $61 million in Q1 2025 and $241 million in Q2 2024. Adjusted Free Cash Flow ($ in millions) $4,439 $5,162 $4,084 $4,396 $4,596 Q2 2024 Q3 2024 Q4 2024 Q1 2025 Q2 2025 12

• 13. Net Debt (Excluding Tower Obligations) & Net Debt to LTM Net Income and Core Adj. EBITDA Ratios ($ in billions) $73.5 $72.6 $75.2 $76.0 $75.0 7.8x 7.0x 6.6x 6.4x 6.1x 2.4x 2.3x 2.4x 2.3x 2.3x Net Debt (excluding Tower Obligations) Net Debt to LTM Net Income Ratio Net Debt to LTM Core Adjusted EBITDA Ratio Q2 2024 Q3 2024 Q4 2024 Q1 2025 Q2 2025 Stockholder Returns ($ in millions) $3,036 $1,402 $5,633 $3,473 $3,465 $2,277 $644 $4,619 $2,470 $2,469 $759 $758 $1,014 $1,003 $996 Stock buybacks Dividends paid Q2 2024 Q3 2024 Q4 2024 Q1 2025 Q2 2025 Total debt, excluding tower obligations, at the end of Q2 2025 was $85.3 billion. Net debt, excluding tower obligations, at the end of Q2 2025 was $75.0 billion. ■ On December 13, 2024, the Board of Directors announced a stockholder return program for up to $14.0 billion that will run through December 31, 2025, consisting of additional repurchases of shares and payment of cash dividends with the next dividend payable on September 11, 2025. On a cumulative basis, since the company initiated its stockholder return program in Q3 2022, a total of $38.3 billion has been returned to stockholders as of June 30, 2025, with 193.9 million shares repurchased for approximately $32.3 billion, and cumulative cash dividends of $6.0 billion. ■ During Q2 2025, 10.1 million shares were repurchased for approximately $2.5 billion. ■ During Q2 2025, the company paid a cash dividend of $0.88 per share of common stock, or approximately $996 million, on June 12, 2025. ■ The company continues to target a net debt to Core Adjusted EBITDA ratio of approximately 2.5x at year-end 2025, driven by funding for the closing of announced acquisitions and spectrum transactions. 13

• 14. 2025 Outlook Metric Previous Revised Change at Midpoint Postpaid net customer additions 5.5 to 6.0 million 6.1 to 6.4 million 500 thousand Net income (1) N/A N/A N/A Effective tax rate 24% to 26% 24% to 26% No change Core Adjusted EBITDA (2) $33.2 to $33.7 billion $33.3 to $33.7 billion $50 million Net cash provided by operating activities $27.0 to $27.5 billion $27.1 to $27.5 billion $50 million Capital expenditures (3) ~$9.5 billion ~$9.5 billion No change Adjusted Free Cash Flow $17.5 to $18.0 billion $17.6 to $18.0 billion $50 million T-Mobile’s 2025 guidance above reflects the inclusion of Metronet, and excludes the pending acquisition of UScellular. (1) We are not able to forecast Net income on a forward-looking basis without unreasonable efforts due to the high variability and difficulty in predicting certain items that affect GAAP Net income, including, but not limited to, Income tax expense and Interest expense. Core Adjusted EBITDA should not be used to predict Net income as the difference between this measure and Net income is variable. (2) Management uses Core Adjusted EBITDA as a measure to monitor the financial performance of our operations, excluding the impact of lease revenues from our related device financing programs. (3) Capital expenditures means cash purchases of property and equipment, including capitalized interest. 14

• 15. Investor Relations Cathy Yao Matthew Hale Jon Lanterman Senior Vice President Senior Director Senior Director Investor Relations Investor Relations Investor Relations Chris Lo Rose Kopecky Charles Buffum Danna Tao Investor Relations Investor Relations Investor Relations Investor Relations Manager Manager Manager Manager investor.relations@t-mobile.com https://investor.t-mobile.com 15

• 16. T-Mobile US, Inc. Condensed Consolidated Balance Sheets (Unaudited) (in millions, except share and per share amounts) June 30, 2025 December 31, 2024 Assets Current assets Cash and cash equivalents $ 10,259 $ 5,409 Accounts receivable, net of allowance for credit losses of $172 and $176 4,598 4,276 Equipment installment plan receivables, net of allowance for credit losses and imputed discount of $625 and $656 4,226 4,379 Inventory 1,690 1,607 Prepaid expenses 1,125 880 Other current assets 4,874 1,853 Total current assets 26,772 18,404 Property and equipment, net 37,481 38,533 Operating lease right-of-use assets 24,735 25,398 Financing lease right-of-use assets 3,105 3,091 Goodwill 13,460 13,005 Spectrum licenses 95,928 100,558 Other intangible assets, net 2,438 2,512 Equipment installment plan receivables due after one year, net of allowance for credit losses and imputed discount of $151 and $158 1,975 2,209 Other assets 6,749 4,325 Total assets $ 212,643 $ 208,035 Liabilities and Stockholders' Equity Current liabilities Accounts payable and accrued liabilities $ 7,802 $ 8,463 Short-term debt 6,408 4,068 Deferred revenue 1,217 1,222 Short-term operating lease liabilities 3,343 3,281 Short-term financing lease liabilities 1,157 1,175 Other current liabilities 2,175 1,965 Total current liabilities 22,102 20,174 Long-term debt 75,018 72,700 Long-term debt to affiliates 1,497 1,497 Tower obligations 3,603 3,664 Deferred tax liabilities 18,468 16,700 Operating lease liabilities 25,646 26,408 Financing lease liabilities 1,188 1,151 Other long-term liabilities 4,014 4,000 Total long-term liabilities 129,434 126,120 Commitments and contingencies Stockholders' equity Common stock, par value $0.00001 per share, 2,000,000,000 shares authorized; 1,274,176,396 and 1,271,074,364 shares issued, 1,127,450,618 and 1,144,579,681 shares outstanding — — Additional paid-in capital 69,008 68,798 Treasury stock, at cost, 146,725,778 and 126,494,683 shares issued (25,569) (20,584) Accumulated other comprehensive loss (908) (857) Retained earnings 18,576 14,384 Total stockholders' equity 61,107 61,741 Total liabilities and stockholders' equity $ 212,643 $ 208,035 16

• 17. T-Mobile US, Inc. Condensed Consolidated Statements of Comprehensive Income (Unaudited) Three Months Ended Six Months Ended June 30, (in millions, except share and per share amounts) June 30, 2025 March 31, 2025 June 30, 2024 2025 2024 Revenues Postpaid revenues $ 14,078 $ 13,594 $ 12,899 $ 27,672 $ 25,530 Prepaid revenues 2,643 2,643 2,592 5,286 4,995 Wholesale and other service revenues 717 688 938 1,405 2,000 Total service revenues 17,438 16,925 16,429 34,363 32,525 Equipment revenues 3,439 3,704 3,106 7,143 6,357 Other revenues 255 257 237 512 484 Total revenues 21,132 20,886 19,772 42,018 39,366 Operating expenses Cost of services, exclusive of depreciation and amortization shown separately below 2,717 2,602 2,664 5,319 5,352 Cost of equipment sales, exclusive of depreciation and amortization shown separately below 4,659 4,798 4,088 9,457 8,487 Selling, general and administrative 5,397 5,488 5,142 10,885 10,280 Depreciation and amortization 3,146 3,198 3,248 6,344 6,619 Total operating expenses 15,919 16,086 15,142 32,005 30,738 Operating income 5,213 4,800 4,630 10,013 8,628 Other expense, net Interest expense, net (922) (916) (854) (1,838) (1,734) Other (expense) income, net (11) (46) (8) (57) 12 Total other expense, net (933) (962) (862) (1,895) (1,722) Income before income taxes 4,280 3,838 3,768 8,118 6,906 Income tax expense (1,058) (885) (843) (1,943) (1,607) Net income $ 3,222 $ 2,953 $ 2,925 $ 6,175 $ 5,299 Net income $ 3,222 $ 2,953 $ 2,925 $ 6,175 $ 5,299 Other comprehensive income (loss), net of tax Reclassification of loss from cash flow hedges, net of tax effect of $16, $16, $15, $32 and $30 47 46 43 93 86 Gains (losses) on fair value hedges, net of tax effect of $13, $(61), $(10), $(48) and $(10) 37 (177) (30) (140) (30) Unrealized loss on foreign currency translation adjustment, net of tax effect of $0, $0, $0, $0 and $0 (1) — — (1) — Amortization of actuarial gain, net of tax effect of $(1), $0, $(1), $(1) and $(3) (2) (1) (4) (3) (9) Other comprehensive income (loss) 81 (132) 9 (51) 47 Total comprehensive income $ 3,303 $ 2,821 $ 2,934 $ 6,124 $ 5,346 Earnings per share Basic $ 2.84 $ 2.59 $ 2.50 $ 5.43 $ 4.50 Diluted $ 2.84 $ 2.58 $ 2.49 $ 5.42 $ 4.49 Weighted-average shares outstanding Basic 1,132,760,465 1,140,537,935 1,170,025,862 1,136,627,715 1,177,662,179 Diluted 1,134,846,966 1,144,655,297 1,172,447,353 1,139,770,739 1,180,929,879 17

• 18. T-Mobile US, Inc. Condensed Consolidated Statements of Cash Flows (Unaudited) Three Months Ended Six Months Ended June 30, (in millions) June 30, 2025 March 31, 2025 June 30, 2024 2025 2024 Operating activities Net income $ 3,222 $ 2,953 $ 2,925 $ 6,175 $ 5,299 Adjustments to reconcile net income to net cash provided by operating activities Depreciation and amortization 3,146 3,198 3,248 6,344 6,619 Stock-based compensation expense 200 186 164 386 304 Deferred income tax expense 937 771 747 1,708 1,462 Bad debt expense 265 323 255 588 537 Losses from sales of receivables 19 22 25 41 46 Changes in operating assets and liabilities Accounts receivable (338) (93) (1,286) (431) (1,702) Equipment installment plan receivables 65 24 155 89 432 Inventory 264 (318) 221 (54) 391 Operating lease right-of-use assets 883 855 872 1,738 1,728 Other current and long-term assets (671) 10 (416) (661) (256) Accounts payable and accrued liabilities 107 (268) 38 (161) (1,696) Short- and long-term operating lease liabilities (886) (898) (1,148) (1,784) (2,165) Other current and long-term liabilities (82) (88) (360) (170) (532) Other, net (139) 170 81 31 138 Net cash provided by operating activities 6,992 6,847 5,521 13,839 10,605 Investing activities Purchases of property and equipment, including capitalized interest of $(10), $(10), $(8), $(20) and $(17) (2,396) (2,451) (2,040) (4,847) (4,667) Purchases of spectrum licenses and other intangible assets, including deposits (842) (73) (156) (915) (217) Proceeds from the sale of property, equipment and intangible assets 2,066 7 7 2,073 23 Proceeds related to beneficial interests in securitization transactions — — 958 — 1,848 Acquisition of companies, net of cash acquired 1 (727) (390) (726) (390) Investments in unconsolidated affiliates, net (908) (75) — (983) — Other, net 520 (90) (57) 430 (62) Net cash used in investing activities (1,559) (3,409) (1,678) (4,968) (3,465) Financing activities Proceeds from issuance of long-term debt, net (6) 7,774 2,136 7,768 5,609 Repayments of financing lease obligations (331) (315) (351) (646) (678) Repayments of long-term debt (3,257) (479) (2,723) (3,736) (2,946) Repurchases of common stock (2,555) (2,494) (2,387) (5,049) (5,981) Dividends on common stock (996) (1,003) (759) (1,999) (1,528) Tax withholdings on share-based awards (30) (272) (16) (302) (208) Other, net (30) (18) (34) (48) (68) Net cash (used in) provided by financing activities (7,205) 3,193 (4,134) (4,012) (5,800) Effect of exchange rate changes on cash and cash equivalents, including restricted cash 13 — — 13 — Change in cash and cash equivalents, including restricted cash (1,759) 6,631 (291) 4,872 1,340 Cash and cash equivalents, including restricted cash Beginning of period 12,344 5,713 6,938 5,713 5,307 End of period $ 10,585 $ 12,344 $ 6,647 $ 10,585 $ 6,647 18

• 19. T-Mobile US, Inc. Condensed Consolidated Statements of Cash Flows(Continued) (Unaudited) Three Months Ended Six Months Ended June 30, (in millions) June 30, 2025 March 31, 2025 June 30, 2024 2025 2024 Supplemental disclosure of cash flow information Interest payments, net of amounts capitalized $ 992 $ 934 $ 935 $ 1,926 $ 1,831 Operating lease payments 1,202 1,214 1,457 2,416 2,801 Income tax payments 347 15 107 362 114 Non-cash investing and financing activities Non-cash beneficial interest obtained in exchange for securitized receivables $ — $ — $ 833 $ — $ 1,494 Change in accounts payable and accrued liabilities for purchases of property and equipment (131) (463) (232) (594) (1,126) Operating lease right-of-use assets obtained in exchange for lease obligations 593 481 344 1,074 831 Financing lease right-of-use assets obtained in exchange for lease obligations 430 248 311 678 574 Deferred consideration related to the Ka’ena Acquisition — — 210 — 210 19

• 20. T-Mobile US, Inc. Supplementary Operating and Financial Data (Unaudited) Quarter Six Months Ended June 30, (in thousands) Q1 2024 Q2 2024 Q3 2024 Q4 2024 Q1 2025 Q2 2025 2024 2025 Customers, end of period Postpaid phone customers 76,468 77,245 78,110 79,013 79,508 80,338 77,245 80,338 Postpaid other customers (1) 22,804 23,365 24,075 25,105 25,947 26,946 23,365 26,946 Total postpaid customers 99,272 100,610 102,185 104,118 105,455 107,284 100,610 107,284 Prepaid customers (2) 21,600 25,283 25,307 25,410 25,455 25,494 25,283 25,494 Total customers 120,872 125,893 127,492 129,528 130,910 132,778 125,893 132,778 Adjustments to customers (1) (2) — 3,504 — — — 97 3,504 97 (1) In the second quarter of 2025, we acquired 97,000 fiber customers from Lumos. (2) In the second quarter of 2024, we acquired 3,504,000 prepaid customers through our acquisition of Ka’ena, which includes the impact of certain base adjustments to align the policies of Ka’ena and T-Mobile. Quarter Six Months Ended June 30, (in thousands) Q1 2024 Q2 2024 Q3 2024 Q4 2024 Q1 2025 Q2 2025 2024 2025 Net customer additions (losses) Postpaid phone customers 532 777 865 903 495 830 1,309 1,325 Postpaid other customers 688 561 710 1,030 842 902 1,249 1,744 Total postpaid customers 1,220 1,338 1,575 1,933 1,337 1,732 2,558 3,069 Prepaid customers (48) 179 24 103 45 39 131 84 Total net customer additions 1,172 1,517 1,599 2,036 1,382 1,771 2,689 3,153 Migrations from prepaid to postpaid plans 145 140 175 160 115 205 285 320 Quarter Six Months Ended June 30, Q1 2024 Q2 2024 Q3 2024 Q4 2024 Q1 2025 Q2 2025 2024 2025 Churn Postpaid phone churn 0.86 % 0.80 % 0.86 % 0.92 % 0.91 % 0.90 % 0.83 % 0.90 % Prepaid churn 2.75 % 2.54 % 2.78 % 2.85 % 2.68 % 2.65 % 2.64 % 2.67 % Quarter Six Months Ended June 30, Q1 2024 Q2 2024 Q3 2024 Q4 2024 Q1 2025 Q2 2025 2024 2025 Postpaid upgrade rate Postpaid device upgrade rate 2.4 % 2.3 % 2.6 % 3.6 % 2.8 % 2.5 % 4.9 % 5.3 % 20

• 21. T-Mobile US, Inc. Supplementary Operating and Financial Data (Unaudited) Quarter Six Months Ended June 30, (in thousands) Q1 2024 Q2 2024 Q3 2024 Q4 2024 Q1 2025 Q2 2025 2024 2025 Accounts, end of period Total postpaid accounts (1) 30,015 30,316 30,631 30,894 31,099 31,502 30,316 31,502 (1) In the second quarter of 2025, we acquired 85,000 postpaid accounts from Lumos. Quarter Six Months Ended June 30, (in thousands) Q1 2024 Q2 2024 Q3 2024 Q4 2024 Q1 2025 Q2 2025 2024 2025 Net account additions Postpaid net account additions 218 301 315 263 205 318 519 523 Quarter Six Months Ended June 30, (in thousands) Q1 2024 Q2 2024 Q3 2024 Q4 2024 Q1 2025 Q2 2025 2024 2025 5G broadband customers, end of period Postpaid 5G broadband customers 4,634 4,992 5,377 5,742 6,129 6,556 4,992 6,556 Prepaid 5G broadband customers 547 595 625 688 725 752 595 752 Total 5G broadband customers, end of period 5,181 5,587 6,002 6,430 6,854 7,308 5,587 7,308 Quarter Six Months Ended June 30, (in thousands) Q1 2024 Q2 2024 Q3 2024 Q4 2024 Q1 2025 Q2 2025 2024 2025 5G broadband - net customer additions Postpaid 5G broadband customers 346 358 385 365 387 427 704 814 Prepaid 5G broadband customers 59 48 30 63 37 27 107 64 Total 5G broadband net customer additions 405 406 415 428 424 454 811 878 Quarter Six Months Ended June 30, (in millions) Q1 2024 Q2 2024 Q3 2024 Q4 2024 Q1 2025 Q2 2025 2024 2025 Device financing - equipment installment plans Gross EIP financed $ 3,218 $ 3,037 $ 3,304 $ 4,689 $ 3,565 $ 3,503 $ 6,255 $ 7,068 EIP billings 3,880 3,604 3,423 3,509 3,551 3,553 7,484 7,104 EIP receivables, net 5,967 5,556 5,347 6,588 6,405 6,201 5,556 6,201 Device financing - leased devices Lease revenues $ 35 $ 26 $ 21 $ 11 $ 1 $ 6 $ 61 $ 7 Leased device depreciation 22 15 11 6 4 1 37 5 Quarter Six Months Ended June 30, (in dollars) Q1 2024 Q2 2024 Q3 2024 Q4 2024 Q1 2025 Q2 2025 2024 2025 Operating measures Postpaid ARPA $ 140.88 $ 142.54 $ 145.60 $ 146.28 $ 146.22 $ 149.87 $ 141.71 $ 148.06 Postpaid phone ARPU 48.79 49.07 49.79 49.73 49.38 50.62 48.93 50.00 Prepaid ARPU 37.18 35.94 35.81 35.49 34.67 34.63 36.52 34.65 21

• 22. T-Mobile US, Inc. Supplementary Operating and Financial Data (continued) (Unaudited) Quarter Six Months Ended June 30, (in millions, except percentages) Q1 2024 Q2 2024 Q3 2024 Q4 2024 Q1 2025 Q2 2025 2024 2025 Financial measures Service revenues $ 16,096 $ 16,429 $ 16,725 $ 16,928 $ 16,925 $ 17,438 $ 32,525 $ 34,363 Equipment revenues $ 3,251 $ 3,106 $ 3,207 $ 4,699 $ 3,704 $ 3,439 $ 6,357 $ 7,143 Lease revenues 35 26 21 11 1 6 61 7 Equipment sales $ 3,216 $ 3,080 $ 3,186 $ 4,688 $ 3,703 $ 3,433 $ 6,296 $ 7,136 Total revenues $ 19,594 $ 19,772 $ 20,162 $ 21,872 $ 20,886 $ 21,132 $ 39,366 $ 42,018 Net income $ 2,374 $ 2,925 $ 3,059 $ 2,981 $ 2,953 $ 3,222 $ 5,299 $ 6,175 Net income margin 14.7 % 17.8 % 18.3 % 17.6 % 17.4 % 18.5 % 16.3 % 18.0 % Adjusted EBITDA $ 7,652 $ 8,053 $ 8,243 $ 7,916 $ 8,259 $ 8,547 $ 15,705 $ 16,806 Adjusted EBITDA margin 47.5 % 49.0 % 49.3 % 46.8 % 48.8 % 49.0 % 48.3 % 48.9 % Core Adjusted EBITDA $ 7,617 $ 8,027 $ 8,222 $ 7,905 $ 8,258 $ 8,541 $ 15,644 $ 16,799 Core Adjusted EBITDA margin 47.3 % 48.9 % 49.2 % 46.7 % 48.8 % 49.0 % 48.1 % 48.9 % Cost of services, exclusive of depreciation and amortization $ 2,688 $ 2,664 $ 2,722 $ 2,697 $ 2,602 $ 2,717 $ 5,352 $ 5,319 Sprint Merger-related costs 107 73 — — — — 180 — Other Special Items 1 — 67 75 20 28 1 48 Cost of services, excluding depreciation and amortization and Special Items $ 2,580 $ 2,591 $ 2,655 $ 2,622 $ 2,582 $ 2,689 $ 5,171 $ 5,271 Cost of equipment sales, exclusive of depreciation and amortization $ 4,399 $ 4,088 $ 4,307 $ 6,088 $ 4,798 $ 4,659 $ 8,487 $ 9,457 Selling, general and administrative $ 5,138 $ 5,142 $ 5,186 $ 5,352 $ 5,488 $ 5,397 $ 10,280 $ 10,885 Sprint Merger-related costs (gain), net 23 (82) — — — — (59) — Other Special Items 12 37 86 (50) 73 (18) 49 55 Selling, general and administrative, excluding Special Items $ 5,103 $ 5,187 $ 5,100 $ 5,402 $ 5,415 $ 5,415 $ 10,290 $ 10,830 Total bad debt expense and losses from sales of receivables $ 303 $ 280 $ 322 $ 349 $ 345 $ 284 $ 583 $ 629 Bad debt and losses from sales of receivables as a percentage of Total revenues 1.5 % 1.4 % 1.6 % 1.6 % 1.7 % 1.3 % 1.5 % 1.5 % Cash purchases of property and equipment including capitalized interest $ 2,627 $ 2,040 $ 1,961 $ 2,212 $ 2,451 $ 2,396 $ 4,667 $ 4,847 Capitalized interest 9 8 9 8 10 10 17 20 Net cash proceeds from securitization $ (29) $ (30) $ (29) $ (27) $ (26) $ (23) $ (59) $ (49) Net cash payments for Sprint Merger-related costs $ 293 $ 241 $ 124 $ 109 $ 61 $ 61 $ 534 $ 122 22

• 23. T-Mobile US, Inc. Supplementary Operating and Financial Data (Unaudited) Quarter Six Months Ended June 30, (in millions, except share and per share amounts) Q1 2024 Q2 2024 Q3 2024 Q4 2024 Q1 2025 Q2 2025 2024 2025 Stockholder returns Total repurchases $ 3,568 $ 2,277 $ 644 $ 4,619 $ 2,470 $ 2,469 $ 5,845 $ 4,939 Total shares repurchased 21,933,790 13,979,843 3,179,707 20,283,582 10,091,227 10,148,791 35,913,633 20,240,018 Average purchase price per share $ 162.69 $ 162.85 $ 202.45 $ 227.72 $ 244.77 $ 243.32 $ 162.75 $ 244.04 Total dividends paid $ 769 $ 759 $ 758 $ 1,014 $ 1,003 $ 996 $ 1,528 $ 1,999 Dividends per share $ 0.65 $ 0.65 $ 0.65 $ 0.88 $ 0.88 $ 0.88 $ 1.30 $ 1.76 Total stockholder returns $ 4,337 $ 3,036 $ 1,402 $ 5,633 $ 3,473 $ 3,465 $ 7,373 $ 6,938 Cumulative total repurchases $ 19,775 $ 22,052 $ 22,696 $ 27,315 $ 29,785 $ 32,254 $ 22,052 $ 32,254 Cumulative shares repurchased 136,220,243 150,200,086 153,379,793 173,663,375 183,754,602 193,903,393 150,200,086 193,903,393 Cumulative stockholder returns $ 21,291 $ 24,327 $ 25,729 $ 31,362 $ 34,835 $ 38,300 $ 24,327 $ 38,300 23

• 24. T-Mobile US, Inc. Reconciliation of Non-GAAP Financial Measures to GAAP Financial Measures (Unaudited) This Investor Factbook includes non-GAAP financial measures. The non-GAAP financial measures should be considered in addition to, but not as a substitute for, the information provided in accordance with GAAP. Reconciliations for the non-GAAP financial measures to the most directly comparable GAAP financial measures are provided below. T-Mobile is not able to forecast Net income on a forward-looking basis without unreasonable efforts due to the high variability and difficulty in predicting certain items that affect GAAP net income, including, but not limited to, Income tax expense and Interest expense. Adjusted EBITDA and Core Adjusted EBITDA should not be used to predict Net income, as the difference between either of these measures and Net income is variable. Adjusted EBITDA and Core Adjusted EBITDA are reconciled to Net income as follows: Quarter Six Months Ended June 30, (in millions, except percentages) Q1 2024 Q2 2024 Q3 2024 Q4 2024 Q1 2025 Q2 2025 2024 2025 Net income $ 2,374 $ 2,925 $ 3,059 $ 2,981 $ 2,953 $ 3,222 $ 5,299 $ 6,175 Adjustments: Interest expense, net 880 854 836 841 916 922 1,734 1,838 Other (income) expense, net (20) 8 (7) (94) 46 11 (12) 57 Income tax expense 764 843 908 858 885 1,058 1,607 1,943 Operating income 3,998 4,630 4,796 4,586 4,800 5,213 8,628 10,013 Depreciation and amortization 3,371 3,248 3,151 3,149 3,198 3,146 6,619 6,344 Stock-based compensation (1) 140 147 143 156 168 178 287 346 Sprint Merger-related costs (gain), net (2) 130 (9) — — — — 121 — UScellular Merger-related costs (3) — — 16 10 14 33 — 47 Legal-related expenses (recoveries), net (4) — 15 1 (105) 6 (4) 15 2 Other, net (5) 13 22 136 120 73 (19) 35 54 Adjusted EBITDA 7,652 8,053 8,243 7,916 8,259 8,547 15,705 16,806 Lease revenues (35) (26) (21) (11) (1) (6) (61) (7) Core Adjusted EBITDA $ 7,617 $ 8,027 $ 8,222 $ 7,905 $ 8,258 $ 8,541 $ 15,644 $ 16,799 Net income margin (Net income divided by Service revenues) 14.7 % 17.8 % 18.3 % 17.6 % 17.4 % 18.5 % 16.3 % 18.0 % Adjusted EBITDA margin (Adjusted EBITDA divided by Service revenues) 47.5 % 49.0 % 49.3 % 46.8 % 48.8 % 49.0 % 48.3 % 48.9 % Core Adjusted EBITDA margin (Core Adjusted EBITDA divided by Service revenues) 47.3 % 48.9 % 49.2 % 46.7 % 48.8 % 49.0 % 48.1 % 48.9 % (1) Stock-based compensation includes payroll tax impacts and may not agree to stock-based compensation expense on the Condensed Consolidated Financial Statements. Additionally, certain stock-based compensation expenses associated with the merger with Sprint Corporation (the “Sprint Merger”) have been included in Sprint Merger-related costs (gain), net. (2) Sprint Merger-related costs (gain), net, for the three months ended June 30, 2024, includes the $100 million gain recognized for the extension fee previously paid by DISH associated with the license purchase agreement for 800 MHz spectrum licenses, which was not purchased. (3) UScellular Merger-related costs generally include pre-merger consulting and legal fees. (4) Legal-related expenses (recoveries), net, consists of the settlement of certain litigation and compliance costs associated with the August 2021 cyberattack and is presented net of insurance recoveries. (5) Other, net, primarily consists of certain severance, restructuring and other expenses, gains and losses, not directly attributable to the Sprint Merger or UScellular Merger, which are not reflective of T-Mobile’s core business activities and are, therefore, excluded from Adjusted EBITDA and Core Adjusted EBITDA. 24

• 25. T-Mobile US, Inc. Reconciliation of Non-GAAP Financial Measures to GAAP Financial Measures (continued) (Unaudited) Net debt (excluding tower obligations) to the LTM Net income, LTM Adjusted EBITDA and LTM Core Adjusted EBITDA ratios are calculated as follows: (in millions, except net debt ratios) Mar 31, 2024 Jun 30, 2024 Sep 30, 2024 Dec 31, 2024 Mar 31, 2025 Jun 30, 2025 Short-term debt $ 5,356 $ 5,867 $ 5,851 $ 4,068 $ 8,214 $ 6,408 Short-term financing lease liabilities 1,265 1,252 1,252 1,175 1,136 1,157 Long-term debt 71,361 70,203 72,522 72,700 76,033 75,018 Long-term debt to affiliates 1,496 1,496 1,497 1,497 1,497 1,497 Financing lease liabilities 1,163 1,133 1,185 1,151 1,117 1,188 Less: Cash and cash equivalents (6,708) (6,417) (9,754) (5,409) (12,003) (10,259) Net debt (excluding tower obligations) $ 73,933 $ 73,534 $ 72,553 $ 75,182 $ 75,994 $ 75,009 Divided by: Last twelve months Net income $ 8,751 $ 9,455 $ 10,372 $ 11,339 $ 11,918 $ 12,215 Net debt (excluding tower obligations) to LTM Net income Ratio 8.4 7.8 7.0 6.6 6.4 6.1 Divided by: Last twelve months Adjusted EBITDA $ 29,881 $ 30,529 $ 31,172 $ 31,864 $ 32,471 $ 32,965 Net debt (excluding tower obligations) to LTM Adjusted EBITDA Ratio 2.5 2.4 2.3 2.4 2.3 2.3 Divided by: Last twelve months Core Adjusted EBITDA $ 29,681 $ 30,372 $ 31,047 $ 31,771 $ 32,412 $ 32,926 Net debt (excluding tower obligations) to LTM Core Adjusted EBITDA Ratio 2.5 2.4 2.3 2.4 2.3 2.3 Adjusted Free Cash Flow is calculated as follows: Quarter Six Months Ended June 30, (in millions, except percentages) Q1 2024 Q2 2024 Q3 2024 Q4 2024 Q1 2025 Q2 2025 2024 2025 Net cash provided by operating activities (1) $ 5,084 $ 5,521 $ 6,139 $ 5,549 $ 6,847 $ 6,992 $ 10,605 $ 13,839 Cash purchases of property and equipment, including capitalized interest (2,627) (2,040) (1,961) (2,212) (2,451) (2,396) (4,667) (4,847) Proceeds related to beneficial interests in securitization transactions (1) 890 958 984 747 — — 1,848 — Adjusted Free Cash Flow $ 3,347 $ 4,439 $ 5,162 $ 4,084 $ 4,396 $ 4,596 $ 7,786 $ 8,992 Net cash provided by operating activities margin 31.6 % 33.6 % 36.7 % 32.8 % 40.5 % 40.1 % 32.6 % 40.3 % Adjusted Free Cash Flow margin 20.8 % 27.0 % 30.9 % 24.1 % 26.0 % 26.4 % 23.9 % 26.2 % (1) Effective November 1, 2024, following amendments to the company’s Equipment Installment Plan Sale and Service Receivable Sale arrangements, all cash proceeds associated with the sale of such receivables, a portion of which was previously recognized as Proceeds related to beneficial interests in securitization transactions within investing cash flows, were recognized as operating cash flows. These amendments did not have a net impact on Adjusted Free Cash Flow. 25

• 26. T-Mobile US, Inc. Reconciliation of Non-GAAP Financial Measures to GAAP Financial Measures (continued) (Unaudited) The current guidance range for Adjusted Free Cash Flow is calculated as follows: FY 2025 (in millions) Guidance Range Net cash provided by operating activities $ 27,100 $ 27,500 Cash purchases of property and equipment, including capitalized interest (9,500) (9,500) Adjusted Free Cash Flow $ 17,600 $ 18,000 The previous guidance range for Adjusted Free Cash Flow was calculated as follows: FY 2025 (in millions) Guidance Range Net cash provided by operating activities $ 27,000 $ 27,500 Cash purchases of property and equipment, including capitalized interest (9,500) (9,500) Adjusted Free Cash Flow $ 17,500 $ 18,000 26

• 27. Definitions of Terms Operating and financial measures are utilized by T-Mobile’s management to evaluate its operating performance and, in certain cases, its ability to meet liquidity requirements. Although companies in the wireless industry may not define measures in precisely the same way, T-Mobile believes the measures facilitate key operating performance comparisons with other companies in the wireless industry to provide management, investors and analysts with useful information to assess and evaluate past performance and assist in forecasting future performance. 1. Account - A billing account number that generates revenue. Postpaid accounts generally consist of customers that are qualified for postpaid service utilizing phones, 5G broadband modems, fiber connections, mobile internet devices, including tablets and hotspots, wearables, DIGITS or other connected devices, including SyncUP and IoT, where they generally pay after receiving service. 2. Customer - A SIM number with a unique T-Mobile identifier which is associated with an account that generates revenue. Customers are qualified either for postpaid service utilizing phones, 5G broadband modems, fiber connections, mobile internet devices, including tablets and hotspots, wearables, DIGITS or other connected devices, including SyncUP and IoT, where they generally pay after receiving service, or prepaid service, where they generally pay in advance of receiving service. 3. Churn - The number of customers whose service was deactivated as a percentage of the average number of customers during the specified period further divided by the number of months in the period. The number of customers whose service was deactivated is presented net of customers that subsequently have their service restored within a certain period of time and excludes customers who received service for less than a certain minimum period of time. 4. Postpaid Average Revenue Per Account (“ARPA”) - Average monthly postpaid service revenue earned per account. Postpaid service revenues for the specified period divided by the average number of postpaid accounts during the period, further divided by the number of months in the period. Average Revenue Per User (“ARPU”) - Average monthly service revenue earned per customer. Service revenues for the specified period divided by the average number of customers during the period, further divided by the number of months in the period. Postpaid phone ARPU excludes postpaid other customers and related revenues. Service revenues - Postpaid, including handset insurance, prepaid, wholesale and other service revenues. 5. Cost of services - Costs directly attributable to providing wireless service through the operation of T-Mobile’s network, including direct switch and cell site costs, such as rent, network access and transport costs, utilities, maintenance, associated labor costs, long distance costs, regulatory program costs, roaming fees paid to other carriers and data content costs. Cost of equipment sales - Costs of devices and accessories sold to customers and dealers, device costs to fulfill insurance and warranty claims, write-downs of inventory related to shrinkage and obsolescence, and shipping and handling costs. Selling, general and administrative expenses - Costs not directly attributable to providing wireless service for the operation of sales, customer care and corporate activities. These include all commissions paid to dealers and retail employees for activations and upgrades, labor and facilities costs associated with retail sales force and administrative space, marketing and promotional costs, customer support and billing, bad debt expense and administrative support activities. 6. Net income margin - Net income divided by Service revenues. 7. Adjusted EBITDA and Core Adjusted EBITDA - Adjusted EBITDA represents earnings before Interest expense, net of Interest income, Income tax expense, Depreciation and amortization, stock-based compensation and Special Items. Core Adjusted EBITDA represents Adjusted EBITDA less device lease revenues. Core Adjusted EBITDA and Adjusted EBITDA are non-GAAP financial measures utilized by TMobile’s management, including our chief operating decision maker, to monitor the financial performance of our operations and allocate resources of the Company as a whole. T-Mobile historically used Adjusted EBITDA and T-Mobile currently uses Core Adjusted EBITDA internally as a measure to evaluate and compensate its personnel and management for their performance. T-Mobile uses Adjusted EBITDA and Core Adjusted EBITDA as benchmarks to evaluate its operating performance in comparison to competitors. Management believes analysts and investors use Core Adjusted EBITDA and Adjusted EBITDA as supplemental measures to evaluate overall operating performance and to facilitate comparisons with other wireless communications services companies because they are indicative of T-Mobile’s ongoing operating performance and trends by excluding the impact of Interest expense from financing, non-cash depreciation and amortization from capital investments, non-cash stock-based compensation and Special Items. Management believes analysts and investors use Core Adjusted EBITDA because it normalizes for the transition in the company’s device financing strategy, by excluding the impact of device lease revenues from Adjusted EBITDA, to align with the related depreciation expense on leased devices, which is excluded from the definition of Adjusted EBITDA. Core Adjusted EBITDA and Adjusted EBITDA have limitations as analytical tools and should not be considered in isolation or as a substitute for Income from operations, Net income or any other measure of financial performance reported in accordance with U.S. Generally Accepted Accounting Principles (“GAAP”). 8. Special Items - Certain expenses, gains, and losses which are not reflective of our ongoing performance. Special Items include Sprint Mergerrelated costs (gain), net, UScellular Merger-related costs, certain legal-related recoveries and expenses, restructuring costs not directly attributable to the Sprint Merger or UScellular Merger (including severance), and other non-core gains and losses. 9. Adjusted EBITDA margin and Core Adjusted EBITDA margin - Adjusted EBITDA margin is calculated as Adjusted EBITDA divided by Service revenues. Core Adjusted EBITDA margin is calculated as Core Adjusted EBITDA divided by Service revenues. Adjusted EBITDA margin and Core Adjusted EBITDA margin are non-GAAP financial measures utilized by T-Mobile’s management, including our chief operating decision maker, to monitor the financial performance of our operations and allocate resources of the Company as a whole. 10. Net cash provided by operating activities margin - Net cash provided by operating activities margin is calculated as Net cash provided by operating activities divided by Service revenues. 11. Adjusted Free Cash Flow - Net cash provided by operating activities less cash payments for purchases of property and equipment, plus proceeds from sales of tower sites and proceeds related to beneficial interests in securitization transactions. Adjusted Free Cash Flow is utilized by T-Mobile’s management, investors, and analysts of our financial information to evaluate cash available to pay debt, repurchase shares, pay dividends and provide further investment in the business. 12. Adjusted Free Cash Flow margin - Adjusted Free Cash Flow margin is calculated as Adjusted Free Cash Flow divided by Service revenues. Adjusted Free Cash Flow Margin is utilized by T-Mobile’s management, investors, and analysts to evaluate the company’s ability to convert service revenue efficiently into cash available to pay debt, repurchase shares, pay dividends and provide further investment in the business. 27

• 28. 13. Net debt - Short-term debt, short-term debt to affiliates, long-term debt (excluding tower obligations), and long-term debt to affiliates, shortterm financing lease liabilities and financing lease liabilities, less cash and cash equivalents. 14. Sprint Merger-related costs include: • Integration costs to achieve efficiencies in network, retail, information technology and back office operations, migrate customers to the TMobile network and billing systems and the impact of legal matters assumed as part of the Sprint Merger; • Restructuring costs, including severance, store rationalization and network decommissioning; and • Transaction costs, including legal and professional services related to the completion of the Sprint Merger and the acquisitions of affiliates. 28

• 29. Cautionary Statement Regarding Forward-Looking Statements This communication includes forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. All statements other than statements of historical fact, including information concerning T-Mobile US, Inc.’s future results of operations, are forward-looking statements. These forward-looking statements are generally identified by the words “anticipate,” “believe,” “estimate,” “expect,” “intend,” “may,” “could” or similar expressions. Forward-looking statements are based on current expectations and assumptions, which are subject to risks and uncertainties and may cause actual results to differ materially from the forward-looking statements. Important factors that could affect future results and cause those results to differ materially from those expressed in the forward-looking statements include, among others, the following: competition, industry consolidation and changes in the market for wireless communications services and other forms of connectivity; criminal cyberattacks, disruption, data loss or other security breaches; our inability to timely adopt and effectively deploy network technology developments; our inability to effectively execute our digital transformation and drive customer and employee adoption of emerging technologies; our inability to retain or motivate key personnel, hire qualified personnel or maintain our corporate culture; system failures and business disruptions, allowing for unauthorized use of or interference with our network and other systems; the scarcity and cost of additional wireless spectrum, and regulations relating to spectrum use; the timing and effects of any pending and future acquisition, divestiture, investment, joint venture or merger involving us, including our inability to obtain any required regulatory approval necessary to consummate any such transactions or to achieve the expected benefits of such transactions; adverse economic, political or market conditions in the U.S. and international markets, including changes resulting from increases in inflation or interest rates, tariffs and trade restrictions, supply chain disruptions, fluctuations in global currencies, immigration policies, and impacts of geopolitical instability, such as the Ukraine-Russia and Israel-Hamas wars and further escalations thereof; potential operational delays, higher procurement and operational costs, and regulatory and compliance complexities as result of changes to trade policies, including higher tariffs, restrictions and other economic disincentives to trade; our inability to successfully deliver new products and services; any disruption or failure of our third parties (including key suppliers) to provide products or services for the operation of our business; sociopolitical volatility and polarization and risks related to environmental, social and governance matters; our substantial level of indebtedness and our inability to service our debt obligations in accordance with their terms; changes in the credit market conditions, credit rating downgrades or an inability to access debt markets; our inability to maintain effective internal control over financial reporting; any changes in regulations or in the regulatory framework under which we operate; laws and regulations relating to the handling of privacy, data protection and artificial intelligence; unfavorable outcomes of and increased costs from existing or future regulatory or legal proceedings; difficulties in protecting our intellectual property rights or if we infringe on the intellectual property rights of others; our offering of regulated financial services products and exposure to a wide variety of state and federal regulations; new or amended tax laws or regulations or administrative interpretations and judicial decisions affecting the scope or application of tax laws or regulations; our wireless licenses, including those controlled through leasing agreements, are subject to renewal and may be revoked; our exclusive forum provision as provided in our Certificate of Incorporation; interests of Deutsche Telekom AG (“DT”), our controlling stockholder, which may differ from the interests of other stockholders; our current and future stockholder return programs may not be fully utilized, and our share repurchases and dividend payments pursuant thereto may fail to have the desired impact on stockholder value; future sales of our common stock by DT and SoftBank Group Corp. and our inability to attract additional equity financing outside the United States due to foreign ownership limitations by the Federal Communications Commission; and other risks as disclosed in our most recent annual report on Form 10-K, and subsequent Forms 10-Q and other filings with the Securities and Exchange Commission. Given these risks and uncertainties, readers are cautioned not to place undue reliance on such forward-looking statements. We undertake no obligation to revise or publicly release the results of any revision to these forward-looking statements, except as required by law. About T-Mobile US, Inc. T-Mobile US, Inc. (NASDAQ: TMUS) is America’s supercharged Un-carrier, delivering an advanced 4G LTE and transformative nationwide 5G network that will offer reliable connectivity for all. T-Mobile’s customers benefit from its unmatched combination of value and quality, unwavering obsession with offering them the best possible service experience and undisputable drive for disruption that creates competition and innovation in wireless and beyond. Based in Bellevue, Wash., T-Mobile provides services through its subsidiaries and operates its flagship brands, T-Mobile, Metro by T-Mobile and Mint Mobile. For more information please visit: http://www.t-mobile.com. 29