2021 CORPORATE RESPONSIBILITY REPORT OUR COMPANY OUR GOVERNANCE OUR PEOPLE OUR COMMUNITIES THE ENVIRONMENT THE NUMBERS AND SMALL PRINT WHAT’S INSIDE Connect with T-Mobile This report is aligned to the world’s most widely used standard for sustainability reporting—the Global Reporting Initiative (GRI) Standards, as well as Sustainability Accounting Standards Board (SASB) Standards for our industry. It covers the operations and activities of T-Mobile US, Inc. for the calendar year 2021 (January 1 to December 31) unless otherwise noted. Find out more about the numbers and small print . 3 Our Company 3 CEO Statement 4 About T-Mobile 6 ESG Approach 10 ESG and Industry Trends 11 5G Innovation 13 Our Governance 14 2021 Highlights 15 Ethical Business Practices 18 Corporate Governance 19 Business Continuity 20 Data Privacy 22 Cybersecurity 23 Responsible Supply Chain 26 Our People 27 2021 Highlights 28 Our Culture 29 Diversity, Equity, and Inclusion 35 Employee Engagement, Learning, and Development 38 Health, Safety, and Wellness 40 Our Communities 41 2021 Highlights 42 Digital Equity 47 Philanthropy 50 Disaster Relief 52 The Environment 53 2021 Highlights 54 Climate Change 56 Energy Management 58 Waste and Recycling 59 Product Lifecycle Management 61 Natural Resources Management 63 The Numbers and Small Print 65 Notes About This Report 66 ESG Data 70 T-Mobile Material Topic Definitions 71 GRI Index 88 SASB Index 26 Celebrating our people at T-Mobile 52 Caring for our environment 40 4040 Givin Giving baGiving ba g back ck tck t to oo the co the communit the communit mmunity yy