Turk Telekom group provides integrated telecommunication services from PSTN, GSM to wide band internet. Turk Telekom group companies have 17.3 millions of PSTN customers, 6 millions of ADSL customers and 21.6 million GSM customers as of March 31, 2009. With its modern network substructure, covering the whole country, the group companies offer a wide range of services to its personal and corporate customers. Turk Telekom, who is the owner of the 99,9% of 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. Turk Telekom also supports Albtelecom in Albania. The 55% of the shares of Turk Telekom belongs to Oger Telekomünikasyon A.Ş. and the 30% of the shares belongs to Undersecretariat of Treasure of Turkey. The remaining 15% of shares has been offered to public.