Samsung Galaxy S4 I9505 16GB 4G LTE Unlocked GSM Quad-Core Phone - White 2G: GSM 850 / 900 / 1800 / 1900, 3G: HSDPA 850 / 900 / 1900 / 2100, 4G: LTE 800 / 850 / 900 / 1800 / 2100 / 2600 5" Super AMOLED Capacitive Multi-Touchscreen w/ Protective Corning Gorilla Glass 3 and TouchWiz UI" Android v4.2.2 JellyBean (upgradable to v4.4.2 KitKat), Quad-Core 1.9 GHz Krait 300 Processor, Chipset: Qualcomm APQ864T Snapdragon 6, Adreno 320 Graphics 13 Megapixel Camera (4160 x 3120 pixels) w/ Autofocus, LED Flash + Front-facing 2 Megapixels 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.