First of all, no IPHONE of any generation supports video calling. Only IPHONE4 can conduct video chat through FACETIME. FACETIME is just a foreign dating software, which is connected to the Internet through IPHONE4 and needs your traffic. IPHONE4 only supports Unicom 3G(WCDMA), and only the network speed of Unicom 3G can satisfy the network-dependent mobile phone of IP4. Mobile 3G network speed is very slow, and most of them are supported by domestic mobile phones. Only MOTO and Samsung have a small number of imported mobile phones to support mobile 3G.