Turkcell Iletisim Hizmetleri A.S. engages in establishing and operating a global system for mobile communications network primarily in Turkey. It provides mobile voice, broadband, and other services on postpaid and prepaid basis. The company offers voice services, mobile broadband, and other mobile services; and various consumer products and services, such as credit balance, call management, purchases and payments via SMS, security services, information packages, finance and government-related transactions via mobile, entertainment services, and social networks, such as Facebook SMS, Twitter SMS, and other chat services. It also provides various mobile applications, mobile marketing, corporate products and services, partner services, smart enablers services, authentication services, location-based services, and machine to machine communications. In addition, the company offers mobile payment, digital media, and international roaming services. As of December 31, 2012, it had approximately 21.9 million prepaid subscribers and 13.2 million postpaid subscribers. The company sells its products and services through distributors, distribution centers, corporate solution centers, non exclusive dealers, communication centers, stores, and consumer electronic chains, as well as points of sale for prepaid airtime, including digital channels, ATMs, POSs, Web, call centers, supermarkets, gas stations, and kiosks. The company was founded in 1993 and is headquartered in Istanbul, Turkey. Turkcell Iletisim Hizmetleri A.S. is a subsidiary of Turkcell Holding A.S.