Sony Ericsson Z520a Unlocked Cell Phone with Camera, MP3 Player-U.S. Version with Warranty (Blue/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 capabilities Clamshell phone with dual screens; VGA digital camera with video capture; MP3 player Bluetooth for handsfree devices; speakerphone; organizer; access to personal email; 16 MB internal memory (no expansion) Up to 4.5 hours of digital talk time and 300 hours of standby time