Samsung Galaxy Note 4 N910a AT&T Unlocked Cellphone, 32GB, Black 2G: 850 / 900 / 1800 / 1900, 3G: B1 / B2 / B4, 4G: LTE B2 / B4 / B5 / B12 / B17 5.7-inch Super AMOLED Capacitive Multi-Touchscreen w/ Protective Corning Gorilla Glass 3 Android v4.4.4 (KitKat), Quad-core 2.7 GHz Processor, Chipset: Krait 450, Adreno 420 Graphics 16 Megapixel Camera (3456 x 4608 pixels) w/ Optical Image Stabilization, Autofocus & LED Flash + Front-Facing 3.7 Megapixel Camera Internal Memory: 32GB, 3GB 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.