GRI Index Notes About This Report This report contains certain forward-looking statements based on T-Mobile management’s current assumptions and expectations, including statements regarding our ESG targets, goals, commitments and programs and other business plans, initiatives, and objectives. These statements are typically accompanied by the words “aim,” “hope,” “believe,” “estimate,” “plan,” “aspire,” “may,” “could,” “will,” or similar words. All such statements are intended to enjoy the protection of the safe harbor for forward-looking statements within the meaning of Section 21E of the Securities Exchange Act of 1934, as amended. Our actual future results, including the achievement of our targets, goals, or commitments, could differ materially, and adversely, from our projected results as the result of changes in circumstances, assumptions not being realized, or other risks, uncertainties, and factors. Such risks, uncertainties, and factors include the risk factors discussed in Item 1A of our most recent Annual Report on Form 10-K and subsequent quarterly reports on Form 10-Q filed with the Securities and Exchange Commission (SEC) (such documents are also available on our investor page), as well as, with respect to our ESG targets, goals and commitments outlined in this reporting or elsewhere, and the challenges, assumptions and other methodological considerations associated with same. As such, readers should not place undue reliance on such forward-looking statements. We urge you to consider all of the risks, uncertainties, and factors identified above or discussed in such reports carefully in evaluating the forward-looking statements in this report. T-Mobile cannot assure you that the results reflected or implied by any forward-looking statement will be realized or, even if substantially realized, that those results will have the forecasted or expected consequences and effects. The forward-looking statements in our reporting are made as of the date in which this report is published and we undertake no obligation and expressly disclaim any duty to update these forward-looking statements to reflect subsequent events or circumstances. Additionally, this report contains ESG-related statements based on hypothetical scenarios and assumptions as well as estimates that are subject to a high level of inherent uncertainty, and these statements should not necessarily be viewed as being representative of current or actual risk or performance, or forecasts of expected risk or performance. In addition, historical, current, and forward-looking environmental and social-related statements may be based on standards and metrics for measuring progress, as well as standards for the preparation of any underlying data for those metrics, that are still developing and internal controls and processes that continue to evolve; while these are based on expectations and assumptions believed to be reasonable at the time of preparation, they should not be considered guarantees. Moreover, our disclosures based on any standards may change due to revisions in framework requirements, availability of information, changes in our business or applicable governmental policies, or other factors, some of which may be beyond our control. THE ENVIRONMENT OUR GOVERNANCE OUR COMMUNITIES OUR PEOPLE 2021 CORPORATE RESPONSIBILITY REPORT 65 OUR COMPANY THE NUMBERS AND SMALL PRINT The events, scenarios, and efforts discussed in this report, including both forward-looking statements and other statements, may be significant; however, the inclusion of such statements is not an indication that these contents are necessarily material for the purposes of complying with or reporting pursuant to the U.S. federal securities laws and regulations, even if we use the word “material” or “materiality” in this document in relation to those statements or in other materials that we may release from time to time in connection with the matters discussed herein. Moreover, given the uncertainties, estimates, and assumptions required to make some of the disclosures in this report, and the timelines involved, materiality is inherently difficult to assess far in advance. In addition, given the inherent uncertainty of the estimates, assumptions, and timelines contained in this report, we may not be able to anticipate in advance whether or the degree to which we will or will not be able to meet our plans, targets, or goals. Website references throughout this document are provided for convenience only, and the content on the referenced websites is not incorporated by reference into this document.