T-Mobile US, Inc. is a major American wireless telecommunications operator based in Bellevue, Washington, and is majority-owned by the German firm Deutsche Telekom. Founded in 1994 as VoiceStream Wireless, the company adopted its current branding following Deutsche Telekom’s acquisition in 2001 . Today, it ranks as the second-largest wireless carrier in the U.S., serving approximately 132.8 million subscribers as of June 30, 2025.Over the years, T-Mobile has expanded its reach and capabilities through key acquisitions—most notably Sprint in 2020—and the procurement of Mint Mobile and Ultra Mobile in 2024, as well as the wireless operations of U.S. Cellular in August 2025 . The company powers its services primarily through the T-Mobile and Metro by T-Mobile brands, offering both prepaid and postpaid wireless services along with fast-growing home internet via fixed wireless access (FWA) over its extensive 5G network and fiber infrastructure .Remarkably, T-Mobile has transformed into a technology-forward “Un-carrier” by challenging traditional telecom norms—abandoning long-term contracts, simplifying pricing, and aggressively rolling out 5G across the U.S.