Türk Telekomünikasyon A.Ş. is a state-owned Turkish telecommunications company. Türk Telekom was separated from Turkish Post in 1995. Türk Telekom Group provides integrated telecommunication services for PSTN, GSM, and wideband Internet. The Türk Telekom Group companies had 16.8 million PSTN customers, 6 million ADSL customers and 12.1 million GSM customers in September 2009. With its network substructure covering the whole country, the group's companies offer a wide range of services to personal and corporate customers. Türk Telekom, which owns 99.9% of the shares of the companies TTNET, Argela, Innova, Sebit A.Ş. and AssisTT, is also the owner of 81% of the shares of Avea, which is one of the three GSM operators in Turkey. Türk Telekom also supports Albania's Albtelecom. 61.5% of the shares of Turk Telekom belong to Turkey Wealth Fund, while 30% of the shares belong to the Ministry of Treasury and Finance. The remaining 15% of shares have been offered to the public in Borsa Istanbul. In July 2018, in the course of the Turkish currency and debt crisis, Turkish and international banks took control of Türk Telekom due to billions of dollars in unpaid debt. Wikipedia