[wesscoggin]

verizons version is what verizon calls a world phone, and has dual radios. Sprints version is also a "world phone". Both are primarily CDMA phones and do not pick up Att's 3g signal because it doesn't pick up ATT's 3g band, but they can pick up Att's edge band.
ATT's tilt 2 and TMo's TP2 do not have a CDMA radio and are GSM only.