Turkcell Iletisim Hizmetleri A.S. (Turkcell) is a provider of mobile services in Turkey. The Company provides mobile voice and data services over its global system for mobile communications (GSM) network. Turkcell started its operations in 1994. It signed a 25-year GSM license contract on April 27, 1998 with the Ministry of Transportation of Turkey. Since then, it has continuously increased the variety of its services based on mobile audio and data communication, its quality levels and as a result, number of subscribers. As of September 30, 2007, with its 34,8 million subscribers, Turkcell is not only the leading operator in Turkey, but is also the second biggest GSM operator in Europe in terms of subscriber numbers. 
Turkcell’s shares are traded on Istanbul Stock Exchange (IMKB) and ADR traded on NYSE under the symbol TKC.
Turkcell is Turkey's leading mobile telecommunication company -- It is the only GSM operator in Turkey covering 97% of the population and with a network having 68% EDGE compatibility. Turkcell added 3.9 million new subscribers and increased their numbers to 31.8 million in 2006. According to Telecommunications Authority (TA), the mobile penetration rate increased from 59% in 2005 to 71% in 2006. Turkcell managed to capture a market share of 60%. Large subscriber base and high profitability margins have resulted in strong operational and financial performance. 
Turkey is an attractive market to operate mobile services: