Samsung Galaxy S4 I9500 16GB Unlocked GSM Octa-Core Smartphone - Purple 2G: GSM 850 / 900 / 1800 / 1900, 3G Network: HSDPA 850 / 900 / 1900 / 2100 5-inch Super AMOLED Capacitive Multi-Touchscreen w/ Protective Corning Gorilla Glass 3 Android v4.3 JellyBean ( upgradable) 13 Megapixel Camera (4160 x 3120 pixels)+ Front-Facing 2 Megapixel Camera Internal Memory: 16GB storage, 2GB RAM + microSD Slot Expandable up to 64GB 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.