T-Mobile US, Inc. 10-K

Item 2. Properties Our properties are best described on a collective basis, as no individual property is material. Our property and equipment consists of the following: December 31, 2021 December 31, 2020 Wireless communication systems 66 % 64 % Land, buildings and building equipment 5 % 5 % Data processing equipment and other 29 % 31 % Total 100 % 100 % Wireless communication systems primarily consist of assets used to operate our wireless network and information technology data centers, including switching equipment, radio frequency equipment, tower assets, construction in progress and leasehold improvements related to the wireless network and assets related to the liability for the retirement of long-lived assets. Land, buildings and building equipment primarily consist of land and land improvements, central office buildings or any other buildings that house network equipment, buildings used for administrative and other purposes, related construction in progress and certain network service equipment. Data processing equipment and other primarily consists of data processing equipment, office equipment, capitalized software, leased wireless devices, construction in progress and leasehold improvements. We also lease distributed antenna system and small cell sites, as well as properties throughout the United States that contain data and switching centers, customer call centers, retail locations, warehouses and administrative spaces. Item 3. Legal Proceedings For more information regarding the legal proceedings in which we are involved, see Note 2 – Business Combinations and Note 17 – Commitments and Contingencies of the Notes to the Consolidated Financial Statements. 25 Table of Contents Item 4. Mine Safety Disclosures Not applicable. PART II.