Cingular Wireless is moving ahead with its plans to build the six-city 3G network it inherited from the merger with AT&T Wireless. The carrier promises it will have its UMTS/HSPDA network in up to 20 cities by the end of the year, with an expansion to most major markets by the close of 2006. Download speeds should be 400Kbps to 700Kbps. Cingular also announced that it's planning to add 4,000 new cell sites over the next several months and 4,000 next year, as well as integrate overlapping Cingular and AT&T networks and migrate customers still on AT&T plans to Cingular contracts.