The Nokia 6103 (T-Mobile) and 6102i (AT&T) are upgrades to the 6101 and 6102; these are all some of Nokia's first attempts at a flip phone. Notable features include VGA camera, support for MP3 ringtones, infrared, FM radio, and tri-band support. The later upgrades include bluetooth and a zoom function on the camera. The 6103 also has MyFaves compatibility for T-Mo.

Reviews:
Cnet - 6102
Cnet - 6101
PhoneScoop
PhoneArena

Resources:
AT&T Support
T-Mobile Support
Nokia Site