Samsung Galaxy Note 4 N910T 32GB 4G LTE T-Mobile GSM Unlocked Smartphone Charcoal Black (Certified Refurbished) Only select sellers who maintain a high performance bar may offer Certified Refurbished products on Amazon. Products are tested and certified to look and work like new, with limited to no wear, by a third-party refurbisher. The product is backed by a 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 Vi 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