Array Digital Infrastructure, Inc. owns and operates shared wireless communications infrastructure in the United States, primarily through a portfolio of approximately 4,400 cell towers across 19 major markets that enable the deployment of 5G and other wireless technologies; it generates revenue from leasing tower space to wireless carriers including T-Mobile under master lease agreements, legacy colocation with existing tenants, and emerging sales to new occupants such as AT&T and Verizon; additionally, the company holds noncontrolling partnership investments in wireless operating companies and retains certain wireless spectrum assets. Headquartered in Chicago, Illinois, Array Digital Infrastructure traces its origins to 1983 as the successor to United States Cellular Corporation following a major strategic transformation in 2025, when it sold its wireless operations to T-Mobile US, Inc. for approximately $4.4 billion, retaining its towers, spectrum, and partnerships to focus exclusively on digital infrastructure. Recent developments include the completion of the T-Mobile transaction on August 1, 2025, with Doug Chambers appointed as interim President and CEO; execution of spectrum lease and sale agreements with AT&T expected to close by year-end 2025 and with Verizon by Q3 2026; a license purchase agreement with New Cingular Wireless PCS, LLC (AT&T) announced in November 2025; and achievement of 12% revenue growth in Q2 2025 driven by colocation efforts supported by an in-house sales team established in Q4 2024.