Disclosure# Disclosure Topic 2021 Response 403-9 Work-related injuries For T-Mobile employees: ■ The number of fatalities: 0 ■ The rate of fatalities: 0 ■ The number and rate of high-consequence work-related injuries (excluding fatalities): 3 and 0.004 per 200,000 hours worked ■ The number and rate of recordable work-related injuries: 183 and 0.27 per 200,000 hours worked ■ The main types of work-related injury: Slips/trips/falls, struck against/by object, and strains/sprains ■ The number of hours worked: 135,318,647 hours For all workers who are not employees but whose work and/or workplace is controlled by the organization: Such figures for non-T-Mobile employees are not tracked as T-Mobile is not a controlling entity for on-site safety. In addition, T-Mobile employees are not authorized for high-risk/high-consequence tasks. All such tasks (such as tower climbing, high voltage electrical work) would be completed by a qualified third-party entity that is evaluated holistically by T-Mobile’s Contractor Safety Program. Whether the rates have been calculated based on 200,000 or 1,000,000 hours worked: 200,000 hours worked. Whether and, if so, why any workers have been excluded from this disclosure, including the types of worker excluded: No exclusions of T-Mobile employees. Material Topic: Employee Engagement, Learning, and Development GRI 404: Training and Education 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 > Employee Engagement, Learning, and Development 103-3 Evaluation of the management approach 2021 Corporate Responsibility Report: Our Company > ESG Approach 404-1 Average hours of training per year per employee Employees participated in over 5.4 million hours of training. This number includes only those trackable training hours completed in a formal Learning Management System by all T-Mobile full- and part-time employees. GRI Index Continued 2021 CORPORATE RESPONSIBILITY REPORT OUR PEOPLE OUR GOVERNANCE OUR COMMUNITIES 85 OUR COMPANY THE ENVIRONMENT THE NUMBERS AND SMALL PRINT