Both Nokia 6500S & C are 3 G, the prices are different since 6500S got better function than 6500C
6500C got 2 megapixel camera but 6500S got 320 megapixel;
6500C do not have dual camera so 6500S is more convenience when using video call;
6500C is monoblock and 6500S is slide phone;
6500C got up to 1 GB internal memory but do not have expandable memory, but 6500S got 20 MB internal Memory and micro SD as expandable memory, it can accept up to 4 GB micro SD.