Turkcell Iletisim Hizmetleri A.S. engages in establishing and operating a global system for mobile communications network in Turkey. It provides mobile voice, and Internet services over its mobile communications network; voice services, which include wireless telephone services on a prepaid and postpaid basis; mobile Internet and 3G services; consumer services; Telco services; TV and video services; music services; infotainment services; social community and other services; and mobile financial services. The company also offers Turkcell enablers and platforms; corporate (B2B); corporate telco; authentication; location based; mobile marketing; machine-to-machine communications; and international roaming services. In addition, it provides Mobile Signature, a GSM service that enables customers to sign electronic documents and transactions with a legally-accepted digital signature using GSM SIM cards; and Mobile Billboard, which enables brands to reach their targeted customers. As of December 31, 2010, the company had approximately 23.3 million prepaid subscribers and 10.1 million postpaid subscribers. It sells its products and services through its distribution network consists of distributors, Turkcell distribution centers, corporate solution centers, non exclusive dealers, Turkcell communication centers, Turkcell stores, and consumer electronic Chains, as well as points of sale for prepaid airtime, including ATMs, POS, Web, call centers, supermarkets, and kiosks. The company was founded in 1993 and is headquartered in Istanbul, Turkey. Turkcell Iletisim Hizmetleri AS is a subsidiary of Turkcell Holding A.S.