Samsung Galaxy S3 I747 16GB Unlocked GSM LTE Android Smartphone - Red Internal Memory: 16GB storage, 2GB RAM + microSD Slot Expandable up to 64GB 8 Megapixel Camera (3264 x 2448 pixels) w/ Autofocus, LED Flash + Front-Facing 1.9 Megapixel Camera 4.8" Super AMOLED Capacitive Multi-Touchscreen w/ Protective Corning Gorilla Glass 2 Dual-Core 1.5 GHz Processor, Chipset: Qualcomm MSM896 Snapdragon, Adreno 225 Graphics 2G: GSM 850 / 900 / 1800 / 1900, 3G: HSDPA 850 / 1900 / 2100, 4G: LTE 700 MHz Class 17 / 2100 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.