Unlocked Quadband Dual Sim Android 4.0 Os A7100 Smart Phone SC6820 1.0GHz with WiFi FM 4.0 Inch Capacitive Screen (Black) Unlocked Quad Band Dual SIM GSM 800/850/1800/1900MHz Android 4.0 4 inch Touch Screen Resolution:480*320 pixels QHD screen 256MB 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.