SK Telecom Co., Ltd. is a South Korean wireless telecommunications operator. Headquartered in Seoul, South Korea, SK Telecom builds on its strong innovation, such as Mobile In Vehocle, Smart Payment among others, to end-users in the international market. In Korea, SK Telecom is the leading wireless communications operator, serving more than 24 million subscribers, which is over 50% of the local mobile market. In 2009, the company’s revenue reached KRW 12.1 trillion and net income was KRW 1.29 trillion. SK Telecom was the first to launch and commercialize CDMA, 2.5 CDMA2000 1x, 3G CDMA EV-DO, 3.5G HSDPA/HSUPA (on handsets), Satellite DMB (on handsets) and various other mobile technologies.