T-Mobile International AG can be a German holding company for Deutsche Telekom AG's various mobile communications subsidiaries outside Germany. Operating out of Bonn, Germany, its subsidiaries operate GSM, UMTS and LTE-based cellular networks in Europe, the United States, Puerto Rico and also the U.S. Virgin Islands. The business has financial stakes in mobile operators in Central and Eastern Europe.
The T-Mobile brand is present in 13 European countries - Austria, Croatia (as Hrvatski telekom), Czech Republic, Albania, Germany (as Telekom), Hungary, Macedonia, Montenegro, holland, Poland, Romania and Slovakia, plus the United States, Puerto Rico, and also the U.S. Virgin Islands. It was present in great britain up to 2010, when T-Mobile and Orange S.A. merged to create EE.
Globally, T-Mobile International subsidiaries have a very combined total around 230 million subscribers. T-Mobile International could be the world's fifteenth-largest mobile-phone supplier by subscribers along with the fourth-largest multinational as soon as the UK's Vodafone, India's Airtel, and Spain's Telefonica.