SK텔레콤
SK Telecom (Korean: SK 텔레콤 or 에스케이 텔레콤, ) is a South Korean company specializing in offering mobile phone services, wired and wireless combined services. It is part of the SK Group and has evolved from a first-generation analog cellular system operator to become the company that launched the world's first commercial CDMA service. SK Telecom moved on to operate Korea's first 2.5-G CDMA 2000 1X system, followed by the world's first commercial 3-G synchronized cellular system. SK Telecom also launched the world's first 3.5-G HSDPA and HSUPA services.