If they're not? While the ATT iPhone does have a GSM compatible chipset, it's primarily a UMTS device, which is actually W-CDMA or FOMA. While the Verizon iPhone is CDMA, it's actually CDMA2000/EV-DO. So why do people refer to them by GSM or CDMA when that's not really what we're talking about here? This can lead to comprehension issues, especially when discussing countries like Japan. Japan doesn't support GSM. Japan does support UMTS, which is W-CDMA, which is FOMA. Japan does not have widespread support for CDMA2000 or EV-DO, which is what the verizon iPhone uses. So in reality, shouldn't we be referring to these as the UMTS/W-CDMA and CDMA2000/EV-DO models? I mean, in reality, they are both CDMA phones. One is W-CDMA, and one is EV-DO.