Absolutely -- in the US and a few other countries, anyway. The major alternative is CDMA, which is available in the United States from Sprint and Verizon. You can find a lot of information on CDMA at the CDMA Development Group.
There are other 3G standards recognized by the ITU; you can find more information on the International Mobile Telecommunications-2000 (IMT-2000) 3G standard online. But keep in mind that UMTS and CDMA are the major options as of today, and both are defining upgrade paths to 4G that will carry them (and preserve their market share) for some time to come.
Search and Browse the Expert Answer Center Search and browse more than 25,000 question and
answer pairs from more than 250 TechTarget industry experts.
TechTarget provides technology professionals with the information they need to perform their jobs - from developing strategy, to making cost-effective purchase decisions and managing their organizations' technology projects - with its network of technology-specific websites, events and online magazines.