is available in 16GB
and 32GB capacities. Visually the 3GS and 3G models look identical. The
biggest difference between the 3GS and the 3G is that the 3GS has video
recording capability while the 3G does not. The 3GS comes in black and
is available in 8GB or
16GB capacities. The biggest difference between the 3G iPhone and the
previous model is that the 3G has GPS abilities while the 1st
Generation model does not. It has a plastic back case.
(or 1st Generation
iPhone) is available in 4GB, 8GB, and 16GB capacities. It has an
aluminum back case.