The SCH-i770 packs dual-band CDMA support (850/1900MHz) in addition to dual-band GSM (850/1900MHz), indicating that this might be the first handset to be able to easily switch between GSM and CDMA networks in the USA. Here is the full article from MOBILEBURN.COM .

This is an article from PC World that discusses how to buy a cell phone. It also explains all the terms, such as GSM vs. CDMA.