The Nokia 7310 Supernova candybar is the simplest of the three, with the smallest model number. It will have a 2” QVGA display, 2-megapixel camera, Stereo Bluetooth and microSD slot.
The clamshell 7510 isn’t anything spectacular either, with its 2.2” QVGA internal display and small color external one. Just as the 7310, it is also with a 2MP camera, and features Stereo Bluetooth, microSD slot. 7510 Supernova is a global phone, since it is quad-band GSM.
Specification-wise, Nokia 7610 is very similar to the 7510, but is a slider and has a 3-megapixel camera with VGA video recording capabilities.
source: Nokia Poland via UnwiredView