It was the first time that data, voice and video over the hand-held commercial devices were simultaneously transmitted over both 3g and military tactical radios without any interruptions in service.

IMS defines a complete architecture and framework that enables the convergence of voice, video, data and mobile network technology over an IP-based infrastructure.

SK Telecom, which has just over half of the Korean market, will cut its voice rates by 27 percent to about $35 and its data plans by about 19 percent.