Korea Telecom PortCall Service Co.ltd. in 1985 started in Korea KT powertel electricity business in 1988 has been designated as public ports, the frequency provided by the public telecommunications services since 1995 TRS analog nationwide provide the service first, and in 1998 the first digital service to TRS public network national currency by commercial wireless telephone (individual / group wireless telephone) has been providing the service. TRS service provided by KT powertel simply not possible for the radio calls, cheap mobile phone, SMS services, Data services are also provided with the truly confident that the best of mobile communication services to enterprise.