Sierra Wireless Voq Professional Unlocked Cell Phone with MP3/Video Player, SD/MMC-U.S. Version with Warranty (Black/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 EDGE data capabilities Flip-open QWERTY keyboard for fast, easy text entry; 48 MB of memory Expandable memory via MMC/SD card slot; MP3/video player Up to 6 hours of digital talk time and 100 hours of standby time