Disclosure# Disclosure Topic 2021 Response Social Disclosures Material Topic: Health, Safety, and Wellness GRI 403: Occupational Health and Safety 103-1 Explanation of the material topic and its Boundaries 2021 Corporate Responsibility Report: Our Company > ESG Approach 2021 Corporate Responsibility Report: The Numbers and Small Print > Material Topic Definitions 103-2 The management approach and its components 2021 Corporate Responsibility Report: Our People > Health, Safety, and Wellness T-Mobile’s Environmental, Health, and Safety (EHS) Policies and Standards apply to all T-Mobile operations and subsidiaries. At T-Mobile, we work hard to reduce workplace hazards, comply with all applicable environmental, health, and safety regulations, and implement sustainable business practices. Underpinning our commitment to maintain a safe and healthy workplace and to minimize the impact of business operations on the environment, is our Environmental, Health, and Safety (EHS) Program. Our EHS Program includes current EHS Policies and Standards within a Company EHS Management System that apply to all T-Mobile operations and subsidiaries. 103-3 Evaluation of the management approach 2021 Corporate Responsibility Report: Our Company > ESG Approach The EHS team identifies gaps and implements programs needed to ensure ongoing compliance and continuous improvement of the EHS Management System. This team is overseen by executive leadership and works closely with business units and supervisors across the company to ensure integration of EHS requirements and ongoing reporting of EHS activities. 403-1 Occupational health and safety management system T-Mobile’s EHS Management System is a set of interrelated programs and policies designed to implement, operate, monitor, and improve standards and processes that ensure ongoing compliance and to reduce workplace hazards and environmental impacts. T-Mobile’s EHS Management System is aligned to International Standard Organization (ISO) 14001 (Environmental Management Systems) and ISO 45001 (Occupational Health and Safety Management Systems). Scope of program is all sites enterprise-wide. 403-2 Hazard identification, risk assessment, and incident investigation The EHS team is comprised of experienced professionals who develop, coordinate implementation, monitor, review, and maintain EHS programs to reduce workplace hazards and environmental impacts. The EHS team is overseen by executive leadership and works closely with business units and supervisors across the company to ensure integration of EHS requirements and ongoing reporting of EHS activities. T-Mobile’s EHS program outlines hazard prevention requirements and controls, emergency response plans, medical assistance protocols, awareness and training requirements, and the process for incident reporting and investigations. All EHS-related incidents must be reported via an appropriate mechanism (e.g. the EHS email box, EHS hotline, or the incident management system) according to the Code of Business Conduct. For more information, please contact [email protected] . All unsafe conditions are to be immediately reported to management. Employees can phone concerns to the 24/7 EHS Helpline at 877-604-7233 or email them to [email protected]. Work-related incidents are filed in the Aurora incident reporting system with immediate distribution to EHS, Risk Management/Insurance, and Site Safety. Upon receipt of facts, an incident investigation is commenced. GRI Index Continued 2021 CORPORATE RESPONSIBILITY REPORT OUR PEOPLE OUR GOVERNANCE OUR COMMUNITIES 83 OUR COMPANY THE ENVIRONMENT THE NUMBERS AND SMALL PRINT