Huawei Honor 3C Android 4.2 Quad Core 1.3GHz 3G Dual Sim 5.0 Inch HD Touch Screen 2GB RAM Unlocked 3G Smartphone Black Daul Sim Card Dual Standby RAM : 2GB ; ROM : 8GB 3G : WCDMA 900/2100MHz 2G : GSM 900/1800/1900MHz Unlocked Unlocked cell phones are compatible with GSM carriers like AT&T and T-Mobile as well as with GSM SIM cards (e.g. H20, Straight Talk, and select prepaid carriers). Unlocked cell phones will not work with CDMA Carriers like Sprint, Verizon, Boost or Virgin.