Samsung G850F Galaxy Alpha Factory Unlocked Cell Phone - Unlocked (Charcoal Black) 2G: GSM 850 / 900 / 1800 / 1900, 3G: HSDPA 850 / 900 / 1900 / 2100, 4G: LTE 800 / 900 / 1800 / 1900 / 2100 / 2600 4.7" Super AMOLED Capacitive Multi-Touchscreen TBC Android v4.4.4 (Kit Kat), Quad-Core 1.8 GHz Cortex-A15 & Quad-Core 1.3 GHz Cortex-A7 Processor, Chipset: Exynos 5 Octa 543, Mali-T628 MP6 Graphics 12 Megapixel Camera (4608 x 2592 pixels) w/ Autofocus, LED Flash + Front-Facing 2.1 Megapixel Camera Internal Memory: 32GB, 2GB RAM 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.