3GS iPhone 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 white.
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3G iPhone 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. |
2G iPhone (or 1st Generation iPhone) is available in 4GB, 8GB, and 16GB capacities. It has an aluminum back case. |