i-mate JAQ Unlocked Smartphone with MP3 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 Windows Mobile 5.0 operating system; 2.8-inch touchscreen Full QWERTY keyboard with handwriting recognition; built-in MP3 player; expandable via MiniSD card slot Up to 4 hours of talk time and 150 hours of standby