BLU Win HD - 5-Inch Windows Phone 8.1, 8MP Camera - Unlocked Cell Phone - White (Certified Refurbished) This Certified Refurbished product is factory refurbished, shows limited or no wear, and includes all original accessories plus a 90 day warranty 5.0" Display (720x1280): 8MP Autofocus Camera with LED Flash,Video Recording, 2MP front camera 1GB RAM, 8GB Internal Storage with Micro SD Slot up to 32GB Qualcomm Snapdragon 200 1.2 GHz Quad-Core, Adreno 302 GPU, Windows 8.1 OS Dual SIM, WiFi, Bluetooth, HD Video, Cortana Personal Assistant 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.