Samsung Galaxy S3 Slim DUOS G3812B 8GB Unlocked GSM Dual-SIM Quad-Core Smartphone - White 2G: GSM 850 / 900 / 1800 / 1900 (SIM 1 & SIM 2), 3G: HSDPA 850 / 2100 4.52" TFT Display Capacitive Multi-Touchscreen Android v4.2 (Jelly Bean), Quad-Core 1.2 GHz Processor 5 Megapixel Camera (2592 x 1944 pixels) w/ Autofocus, LED flash + Front-Facing VGA Camera + Video Internal Memory: 8GB, 1GB RAM + microSD Slot Expandable up to 32GB 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.