T-Mobile is a mobile (cell phone) network operator headquartered in Bonn, Germany. It was founded in 1990 and is a part of Deutsche Telekom and belongs to the FreeMove alliance.

T-Mobile is a group of mobile phone companies (all owned by Deutsche Telekom) that operate GSM and UMTS networks in Europe and the United States. The "T" stands for "Telekom". Most subsidiaries (companies) of Deutsche Telekom have names beginning with "T-" like T-Home and T-Online. T-Mobile also owns parts of mobile operators in Eastern Europe. Globally, T-Mobile has 101 million subscribers, making it the world's sixth-largest mobile phone service provider by subscribers and the third-largest multinational after the United Kingdom's Vodafone and Spain's Telefonica.