i-mate Jam Unlocked Smartphone with MP3/Video Player, SD/MMC-U.S. Version with Warranty (Gray) 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. U.S. version tri-band GSM cell phone compatible with 850/1800/1900 frequencies and GPRS data capabilities Windows Mobile 2003 Pocket PC operating system; 1.3-megapixel digital camera with video capture; Bluetooth for handsfree devices Expandable memory via SD/MMC card slot; MP3/video player Up to 3 hours of talk time, up to 180 hours (7.5 days) of standby time