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T-Mobile US, Inc. is an American wireless network operator headquartered in Bellevue, Washington. Its majority shareholder and namesake is the German telecommunications company Deutsche Telekom. T-Mobile is the second largest wireless carrier in the United States, with 140 million subscribers as of September 30, 2025. T-Mobile offers services under the primary retail brands T-Mobile and Metro by T-Mobile (acquired in a 2013 reverse takeover of MetroPCS that also led to T-Mobile's listing on the NASDAQ). In 2020, T-Mobile expanded through the acquisition of Sprint, which also made T-Mobile the operator of Assurance Wireless, a service subsidized by the federal Lifeline program. The company's growth continued in 2024 with the acquisitions of Mint Mobile and Ultra Mobile, two low-cost mobile virtual network operators which remain separate brands. In August 2025, the company acquired the wireless operations of UScellular.