This process of deregulation continued in November 1996, when DT was privatized and had the largest European IPO at the time, with the stock abbreviation 'DT 1'.

Deutsche Bundespost Telekom was renamed Deutsche Telekom AG on Januas part of phase two of the German communications reform. The GSM 900 MHz frequency band was referred to as the 'D-Netz', and Telekom named its service D1 the private consortium awarded the second license (now Vodafone Germany) chose the name D2. On July 1, 1992, it began to operate Germany's first GSM network, along with the C-Netz, as its DeTeMobil subsidiary. On July 1, 1989, West Germany reorganized Deutsche Bundespost and consolidated telecommunications into a new unit, Deutsche Bundespost Telekom. It launched the analog first-generation C-Netz ('C Network', marketed as C-Tel), Germany's first true mobile phone network in 1985. Germany's first mobile-communications services were radiotelephone systems that were owned and operated by the state postal monopoly, Deutsche Bundespost. Logo of Deutsche Bundespost Telekom with posthorn before privatization It was the world's thirteenth-largest mobile-phone service provider by subscribers, and the fourth-largest multinational after the UK's Vodafone, India's Airtel, and Spain's Telefónica. Globally, T-Mobile International's subsidiaries had a combined total of approximately 230 million subscribers. The company had financial stakes in mobile operators in both Central and Eastern Europe. When T-Mobile International AG existed, the holding company was based in Bonn, Germany, and its subsidiaries operated GSM-, UMTS- and LTE-based cellular networks in Europe, the United States, Puerto Rico and the U.S.

By combining its previously separated fixed and mobile subsidiaries to form integrated local businesses, T-Mobile International itself was merged into Deutsche Telekom AG. In 2009, Deutsche Telekom transformed its structure to adopt a regional setup (Germany, Europe, USA). From 2003 to 2007, T-Mobile International was one of Deutsche Telekom's services, in addition to 'Broadband/Fixnet', 'Business Customers' and 'Group HQ and Shared Services'. Since 1999, Deutsche Telekom has owned the holding company T-Mobile International AG for its mobile communications subsidiaries. The name was previously used by subsidiaries in other countries, including Austria (now Magenta Telekom), Croatia (now Hrvatski Telekom), Germany (now Deutsche Telekom), Hungary (now Magyar Telekom), Montenegro (now Crnogorski Telekom), North Macedonia (now Makedonski Telekom), Slovakia (now Slovak Telekom), and the United Kingdom (now EE Limited). The brand is also active in the Czech Republic ( T-Mobile Czech Republic), the Netherlands ( T-Mobile Netherlands), Poland ( T-Mobile Polska), and the United States ( T-Mobile US). T-Mobile is the brand name used by the mobile communications subsidiaries of the German telecommunications company Deutsche Telekom AG.

1 one mobile market