HP iPaq 6940 Unlocked PDA Phone with Wi-Fi, GPS, MP3/Video Player, MiniSD Slot-U.S. Version with Warranty (Silver) This unlocked cell phone is compatible with GSM carriers like AT&T and T-Mobile. Not all carrier features may be supported. It will not work with CDMA carriers like Verizon Wireless, Alltel and Sprint. Quad-band GSM cell phone compatible with 850/900/1800/1900 frequencies and GPRS/EDGE capabilities Microsoft Windows Mobile 5.0 operating system; Bluetooth and Wi-Fi connectivity; GPS for navigation Integrated MP3/video player; expandable memory via MiniSD slot; 3-inch display Pocket Office (Word, Excel, PowerPoint, PDF viewer)