Disclosure# Disclosure Topic 2021 Response 302-2 Energy consumption outside of the organization Energy consumption outside of the organization, in joules or multiples: 7,875,945 GJ Standards, methodologies, assumptions, and/or calculation tools used: Downstream customer energy consumption data is estimated based on device-specific LCA data and in accordance with the GHG Protocol Corporate Value Chain (scope 3) Standard. Source of the conversion factors used: Standard and recognizable conversion factors are used to convert from MWh to GJ (x * 3.600). 302-3 Energy intensity Energy intensity ratio for the organization: 349.39 MWh/PB Organization-specific metric (the denominator) chosen to calculate the ratio: Total petabytes (PB) of network traffic for calendar year 2021 Types of energy included in the intensity ratio; whether fuel, electricity, heating, cooling, steam, or all: All energy in MWh Whether the ratio uses energy consumption within the organization, outside of it, or both: Within the organization For more information, refer to our latest CDP Climate Change response on our reporting page . 302-4 Reduction of energy consumption Amount of reductions in energy consumption achieved as a direct result of conservation and efficiency initiatives, in joules or multiples: 2,025,485 GJ Types of energy included in the reductions; whether fuel, electricity, heating, cooling, steam, or all: Electricity Basis for calculating reductions in energy consumption, such as base year or baseline, including the rationale for choosing it: The energy consumption in the year prior to the implementation of the conservation and efficiency initiatives is used as the baseline. Standards, methodologies, assumptions, and/or calculation tools used: Energy reduction data is collected, calculated, and reported in accordance with the most recent CDP Climate Change Reporting Guidance for Emissions Reduction Initiatives (C4.3). For more information, refer to our latest CDP Climate Change response on our reporting page . Material Topic: Natural Resources Management and Conservation GRI 303: Water and Effluents 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 While T-Mobile uses relatively little water compared to companies in many other industries, we strive to use it in a responsible and sustainable manner to help conserve this important natural resource. Our reporting for water consumption includes domestic water used in our buildings (data centers, call centers, offices, retail stores, switches, warehouse), some cell sites with irrigation, as well as domestic wastewater. We do not include water use for buildings where the water utility is not included in the leasing contracts. 103-2 The management approach and its components 2021 CORPORATE OUR OUR OUR THE THE NUMBERS RESPONSIBILITY REPORT GOVERNANCE PEOPLE COMMUNITIES ENVIRONMENT AND SMALL PRINT GRI Index Continued Environmental Policy 2021 Corporate Responsibility Report: The Environment > Natural Resources Management 76 OUR COMPANY