On July 1, 1992, it began to operate Germany's first GSM network, along with the C-Netz, as its "DeTeMobil" subsidiary. 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". Deutsche Bundespost Telekom was renamed Deutsche Telekom AG on January 1, 1995 as part of phase two of the German communications reform. 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'. In 1999, T-Mobile International AG & Co. KG holding company was founded (later renamed to T-Mobile International AG). In 2002, as DT consolidated its international operations, it anglicized the T-Mobil name to "T-Mobile". On July 5, 2005 Deutsche Telekom transformed its structure and adopted a regional setup (Germany, Europe, USA). Where available, the local mobile businesses were combined with the respective local wireline businesses to follow the integrated business approach. In 2009 T-Mobile International AG was merged into Deutsche Telekom AG. Until 2000, Magenta Telekom (known then as T-Mobile) was a shareholder of the former max.mobil. network. In April 2001, it acquired one hundred percent and subsequently introduced the T-Mobile brand in Austria by rebranding max.mobil. in April 2002 as T-Mobile Austria. It later rebranded again to Magenta Telekom on 6 May 2019, after acquiring the Austrian operations of UPC from Liberty Global in December 2017. In 2005, it acquired former competitor tele.ring from "Western Wireless International". It is now used as a discount brand. tele.ring is an Austrian mobile network operator. Since it was bought by Magenta Telekom (then T-Mobile) in 2006, it is no longer a legally independent company. Tele.ring is administratively independent and now acts primarily as a discount-offer, similar to Yesss and BoB of A1. In the past, tele.ring was known for their aggressive price-politics. T-Mobile entered the Croatian market in October 1999 when DT initially acquired a thirty-five percent interest in Hrvatski telekom, including its cell phone service provider "Cronet". Two years later, DT signed an agreement with the Croatian government to acquire the additional 16 percent needed for a majority holding.