ESG Materiality Assessment T-Mobile’s most recent ESG materiality assessment took place in 2021 after our merger with Sprint to ensure a timely and full picture of the evolving ESG landscape. The assessment included an analysis of emerging ESG trends and standards, survey responses from employees and customers, and in-depth interviews with internal and external stakeholders, including investors, suppliers, community partners, and advocacy organizations. This allowed us to identify and prioritize the most significant ESG issues for our business and stakeholders. Governance topics such as digital privacy and security and ethical business practices scored high. Critical areas of social impact, like digital equity, employee diversity and inclusion, human rights, and health, safety, and wellness, rose to the top. Finally, climate change and waste and recycling were among the top environmental issues. ESG Approach Continued The Key Findings The ESG topics identified as most significant in the assessment are listed below in order of their relevance in the materiality matrix i . Details of these topics are covered in the following sections: GOVERNANCE 1. Digital security and privacy 2. Ethical business practices 3. Human rights 4. Open internet and competitive behavior 5. Business continuity and network resilience 6. Sustainable and responsible supply chain 7. Responsible marketing 8. Corporate governance 9. Economic contribution 10. Partnerships and collaboration RESPONSIBLE BUSINESS SOCIAL 1. Health, wellness, and safety 2. Digital equity 3. Employee diversity (equity and inclusion) 4. Responsible use of products and services 5. Philanthropy and community engagement EQUITABLE OPPORTUNITIES DIGITAL EMPOWERMENT ENVIRONMENTAL 1. Greenhouse gas emissions and climate change 2. Waste and recycling 3. Natural resources management and conservation 4. Energy management 5. Product lifecycle management THRIVING PLANET THE ENVIRONMENT THE NUMBERS AND SMALL PRINT OUR GOVERNANCE OUR COMMUNITIES OUR PEOPLE 2021 CORPORATE RESPONSIBILITY REPORT 9 OUR COMPANY See our complete list of ESG topics and definitions . The information disclosed on these ESG topics in this report should not be considered a characterization of the materiality or financial impact of such topics. For more information, please see Notes About This Report . i T-Mobile, 2020. 2020 Corporate Responsibility Report. T-Mobile, p.51.