에스케이텔레콤(sk telecom) - 번호

SK Telecom is a provider of mobile service in Korea, with 50.5% of the market share as of 2008. Since being established on March 29, 1984 the company evolved from a first generation analogue cellular system, to second generation CDMA, then to the world's first third generation synchronized IMT-2000 cellular system. SK Telecom also became the world’s first to commercialize HSDPA in May, 2006.
From http://en.wikipedia.org/wiki/SK_Telecom