Samsung I8552 Galaxy Win 4.7" Quad Core Dual Sim 8GB Android Smartphone (GSM Factory Unlocked) - Quad-core 1.2 GHz CPU, 4.7 Inches Screen, Dual Camera, 3G 900/2100 MHz - Black Quad Band 2G 850/900/1800/1900 MHz, 3G HSDPA 900/2100 MHz 4.7" Touch Screen, Quad Core 1.2 GHz CPU, Android 4.1 OS 1GB RAM, 8GB ROM, up to 32GB with SD card Dual Cameras, 5MP Primary with autofocus and LED flash 2000mAh Battery, up to 11 hours talk time, Blue Tooth, GPS, WiFi 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.