I warned you
UMTS or Universal Mobile Telecommunications System (external link) is the grand name for upgraded GSM networks. (internal link). More services, faster data speeds. But unlike upgrading your computer by adding more memory or a larger hard drive, UMTS changes GSM's operating system. GSM's old TDMA scheme gives way, at last, to modern CDMA. And therein lies a big problem. Engineers and overeducated theoreticians steeped in TDMA thought and culture (representative example, (internal link) now guide American UMTS networks to an uncertain, rocky rollout.
Poor service, bad coverage, slow data rates, and unhappy customers, will all result from poor network upgrade decisions being made now. Like cutting costs by using some present base station equipment incompatible with CDMA and in general ignoring CDMA principles. Is there hope? Yes. If the TDMA people choose to learn from the CDMA people. That won't happen at first. And it may be like asking a Mac owner to use a PC.