Topic SASB Code Requested Metric 2021 Response Competitive Behavior & Open Internet T C -T L- 5 2 0 a .1 Total amount of monetary losses as a result of legal proceedings associated with anti-competitive behavior regulations For the fiscal year 2021, T-Mobile had no material losses related to litigation or to non-appealable regulatory decisions involving anti-competitive behavior. T C -T L- 5 2 0 a . 2 Average actual sustained download speed of (1) owned and commercially- associated content and (2) non- associated content T-Mobile is committed to an open internet and does not directly or indirectly favor some traffic over other traffic either in exchange for consideration from a third party or to benefit an affiliated entity. For more information on T-Mobile network performance characteristics (including download speeds), customer options, and network management practices, see our Open Internet information page online. TC-TL-520a.3 Description of risks and opportunities associated with net neutrality, paid peering, zero rating, and related practices See T-Mobile’s SEC reports for our disclosures relating to the risks and opportunities associated with laws and regulations addressing net neutrality. Managing Systemic Risks from Technology Disruptions TC-TL-550a.1 (1) System average interruption frequency (2) Customer average interruption duration T-Mobile does not currently disclose the system average interruption frequency. T-Mobile does not currently disclose the customer average interruption duration. TC-TL-550a.2 Discussion of systems to provide unimpeded service during service interruptions At T-Mobile, we understand the importance of reliable communications and connectivity during critical events, like natural disasters and emergency situations. That’s why building in operational and network resilience is vital to the work we do. As a company, we are committed to safeguarding the interests of our customers, employees, and stakeholders in the event of an emergency or significant business disruption. We maintain an Enterprise Continuity Program designed to be best-in-class with proactive measures to reduce risk to enterprise operations and recovery solutions that minimize impact to customers and services during a potential business disruption. With enterprise-wide teams that work to address business continuity, disaster recovery, network availability, emergency response, and customer support, we are relentless at keeping the interests of our customers, employees, and stakeholders at the forefront of our disaster readiness and emergency response work. A team of dedicated, certified, and seasoned business continuity professionals work with all lines of business to help ensure that Business Continuity Plans are current, comprehensive, and effective. Critical operations, processes, and services across the enterprise are identified along with criticality ratings, risks, gaps, and potential impacts of a service disruption. Process, criticality, and risk reviews are conducted on a regular basis. T-Mobile’s Executive Management receives a quarterly risk report inclusive of the efforts and status of the Enterprise Continuity Program. The Enterprise Continuity Program is also reviewed and approved by leadership on an annual basis. SASB Index Continued 2021 CORPORATE RESPONSIBILITY REPORT OUR PEOPLE OUR GOVERNANCE OUR COMMUNITIES 91 OUR COMPANY THE ENVIRONMENT THE NUMBERS AND SMALL PRINT