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Phones using GSM can do both voice and data at the same time, which cannot be done with CDMA.== U.S. Providers and Technologies ==* Verizon - CDMA, UMTS* AT&T Mobility - GSM, UMTS, HSDPA* Sprint - CDMA, UMTS:* Nextel - iDEN* US Cellular - CDMA* T-Mobile - GSM, UMTS, GAN* Cricket Communications - CDMA== Roaming ==A CDMA-only phone from Verizon, Sprint, or US Cellular is only able to roam on other CDMA networks. This is fine in North America, but CDMA networks are rare in Europe and other countries. These three carriers offer phones with built-in GSM support for International traveling, but this feature is missing from their most popular handsets.