Unlocked Quadband Dual Sim Android 4.2 Os with 4.7 Inch Touch Screen Smart Phone - At&t, T-mobile, H20, Simple Mobile and All Other GSM Networks (White) Android 4.2 operating system SC6820 1.0GHz CPU Network Support GSM850/900/1800/1900 4.7" multi-point OLED capacitive touch screen Dual SIM card Dual Standby 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.