Disclosure# Disclosure Topic 2021 Response 404-2 Programs for upgrading employee skills and transition assistance programs Learning and Development Highlights: ■ Employees participated in approximately 5.4 million hours * of training ■ We provided $20.18 million in tuition assistance for 5,803 employees ■ Our Day of Learning reached more than 15,700 employees, employees rated it 4.3 out of 5 stars and 70% would recommend a replay to their peers ■ Our 2021 CareerFest event reached more than 8,700 employees ■ The 2021 Apprenticeship program had a 100% conversion/retention rate for those that completed the program ■ Lead Magenta Next was recognized as the i4cp Next Practice Winner in 2021 ■ 311 joined leadership and career development programs focused on opportunities to enhance capabilities of underrepresented talent At T-Mobile, our people come first, and we won’t stop helping employees achieve their goals. We have a robust lineup of development programs and resources designed to build a diverse group of leaders and empower employees for career success. We are on a mission to deliver learning and create connections across the enterprise for ALL employees to continually evolve their skills and careers so we can achieve something bigger and better together. And, it’s all easily accessible on our Magenta University site, which is our one-stop shop for all things career development and learning. Magenta University helps employees evolve their skills and career, advance leadership expertise, and deepen commitments to DE&I. * Includes only trackable training hours completed in our formal Learning Management System. Material Topic: Employee Diversity (Equity and Inclusion) GRI 405: Diversity and Equal Opportunity 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 Human Rights Statement 2021 Corporate Responsibility Report: Our People > DE&I 103-3 Evaluation of the management approach 2021 Corporate Responsibility Report: Our Company > ESG Approach 405-1 Diversity of governance bodies As of December 31, 2021, our 14-member Board included: 4 women (28.6%) 4 people who belong to a traditionally underrepresented racial/ethnic group (28.6%) Percent between 30-50 years old: 7% Percent above 50 years old: 93% GRI Index Continued 2021 CORPORATE RESPONSIBILITY REPORT OUR PEOPLE OUR GOVERNANCE OUR COMMUNITIES 86 OUR COMPANY THE ENVIRONMENT THE NUMBERS AND SMALL PRINT