Dell Venue Pro Phone 8 GB with Windows 7 Operating System, 5MP Camera for ATT Network With Microsoft Office Mobile built in, you can operate on the go as seamlessly as you would at the office. 5MP Camera with auto-focus and LED flash. Take your gaming experience on the road with the smartphone that lets you play games on Xbox LIVE. New Windows Phone 7.5 experience. It has 8 GB memory space.(Works worldwide) 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.