Samsung Galaxy S4 I9506 16GB 4G LTE Unlocked GSM Quad-Core Smartphone w/ 13MP Camera - Black 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 Android v4.2.2 (Jelly Bean), Quad-Core 2.3 GHz Krait 400 Processor, Chipset: Qualcomm MSM8974 Snapdragon 8, Adreno 330 Graphics 13 Megapixel Camera (4128 x 3096 pixels) w/ Autofocus, LED Flash + Front-Facing 2 Megapixel Camera Internal Memory: 16GB, 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.