Samsung Galaxy S4 T-mobile Sgh-m919 Unlocked GSM Cell Phone - Black Mist (Certified Refurbished) This Certified Refurbished product is tested and certified to look and work like new, with limited to no wear. The refurbishing process includes functionality testing, inspection, and repackaging. The product ships with all relevant accessories but does not include a SIM card, and may arrive in a generic box. This Certified Refurbished product is backed by a minimum 90-day warranty. Only select sellers who maintain a high performance bar may offer Certified Refurbished products on Amazon. 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. DISPLAY: Super AMOLED capacitive touchscreen, 16M colors.1080 x 1920 pixels, 5.0 inches (~441 ppi pixel density).Corning Gorilla Glass ,3TouchWiz UI. 16 GB Storage Capacity (Estimated Free Space 8.56 GB)