Sony Ericsson K850i Cyber-shot Unlocked Cell Phone with 5 MP Camera, U.S./International 3G, Media Player, M2 Memory Slot-U.S. Version with Warranty (Quicksilver Black) 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 US 3G compatibility via 850/1900/2100 UMTS/HSDPA plus EDGE capabilities Powerful 5-megapixel autofocus camera with flash; Memory Stick Micro (M2)/microSD dual expansion slot Blueooth stereo music; digital audio player with FM radio; access to personal email and instant messaging Up to 9 hours of GSM talk time, up to 400 hours (16.7 days) of standby time