The unlikely story of advanced 3G cellular service in the world"s most tightly controlled and secretive country has turned another chapter with the start of network trials. Cellular carrier Orascom said on Monday that it has completed the first 3G call on a WCDMA (Wideband Code Division Multiple Access) trial network in North Korea, and is working towards a commercial launch there later this year. Earlier this year, a 25-year exclusive license to offer 3G cellular service in the country had been awarded to CHEO Technology, a joint venture in which Orascom holds a 75 percent stake and Korea Post and Telecommunications holds the remaining 25 percent. A full commercial service is scheduled to begin in the second half of the year, Orascom said.