Samsung Galaxy Win Pro G3812 Quad-Core Dual-SIM 4.5" Android Smartphone - Factory Unlocked, Quad Core 1.2 GHz, 4.5 Inches Screen, Dual SIM Cards, Dual Cameras - White Quad Band 2G, 3G HSDPA 900/2100 MHz Dual SIM Cards, Quad Core 1.2GHz CPU, 4.5 Inch TFT Touchscreen (540 x 960 Pixels, 245 PPI) 1GB RAM, 4GB ROM, microSD extension up to 64GB Dual Cameras, 5MP Rear Camera with LED Flash, autofocus, Geo-tagging, touch focus 2100 mAh Battery, Bluetooth, GPS, WiFi, Android 4.2.2 Jelly Bean 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.