Samsung S4 series includes four mobile phone models:
1. I9500 supports China Unicom 2G or 3G networks and China Mobile 2G networks;
2. I959, China Telecom customized machine, dual card mobile phone, support China Telecom 3G network, support GSM, SIM card, do not support GSM card Internet access;
3. I9502, China Unicom customized machine, dual card mobile phone, support China Unicom 2G or 3G, support China Mobile 2G network;
4. I9508, China Mobile customized machine, supports China Mobile 2G or 3G network, China Unicom 2G network.