Samsung Galaxy Y Duos S6102b Android Dual SIM Quadband Factory Unlocked Phone - Strong Black Quad Band 2G, 3G 850/2100 MHz 160MB, 512MB ROM, 290MB RAM, microSD up to 32GB CPU: 832 MHz, Android OS, v2.3 (Gingerbread) 3.15" TFT capacitive multi-touchscreen with Samsung TouchWiz 3.15 Megapixel Camera (2048 x 1536 p) with Geo-Tagging 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.