Be very, VERY careful before buying an imported 3G phone. AT&T's existing 3GSM service uses 850MHz and 1900MHz for uplinks & downlinks (in 850/850, 850/1900, and 1900/1900 configurations). AT&T and T-Mobile's upcoming 3GSM services will use 1700MHz for uplink, and 2200MHz for downlink. 3G GSM...