ESG Oversight Oversight of our progress on ESG issues that are important to our business and our stakeholders occurs at the highest levels of our company. This encourages stronger consideration of ESG matters when making decisions and improves cross-functional collaboration. ESG Approach Continued OUR GOVERNANCE STRUCTURE T-Mobile Board of Directors Oversees and reviews management activities and advises on long-term and strategic issues, with a view to enhancing the long-term value of T-Mobile. Outside of the regular cadence of briefings, periodically receives additional updates on enterprise risk, cybersecurity, and other notable ESG matters from management and Board committees. Audit Committee Assists the Board in oversight of T-Mobile’s risk assessment, risk management policies, and compliance with T-Mobile’s Code of Ethics. Receives enterprise risk updates four times a year, including on risks relating to network resilience and business continuity, cybersecurity, and data privacy. Receives an annual fraud risk assessment. Nominating and Corporate Governance Committee Provides oversight of T-Mobile’s compliance and ethics program, cybersecurity, data privacy, sustainability, and corporate social responsibility initiatives. Receives quarterly briefings on key ESG topics, emerging trends, and progress, including cybersecurity and infrastructure security. Receives an annual update on political contributions and charitable spending. Executive Management T-Mobile executives provide oversight of critical ESG issues, risks, and progress on initiatives. Key executives provide updates to the Audit Committee and the Nominating and Corporate Governance Committee. Executives co-lead and serve on internal cross-functional committees to drive enterprise- wide alignment and to provide strategic guidance and effective oversight of key issues. Key Cross-Functional Executive Management Committees Enterprise Risk and Compliance Committee • Information Security and Privacy Council Equity In Action Leadership Task Force • Sustainability Steering Committee • Charitable Giving Steering Committee • Data Privacy Steering Committee and Security Steering Committee DE&I Internal Oversight Committee THE ENVIRONMENT THE NUMBERS AND SMALL PRINT OUR GOVERNANCE OUR COMMUNITIES OUR PEOPLE 2021 CORPORATE RESPONSIBILITY REPORT 7 OUR COMPANY