HTC P4551 TYTN II Microsoft Window Mobile 6 Phone 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/International 3G compatibility via 850/1900/2100 UMTS/HSDPA plus GPRS/EDGE capabilities Full QWERTY keypad; touchscreen tilts up to 40 degrees for optimal viewing; Windows Mobile 6.0 OS Wi-Fi networking (802.11b/g); Bluetooth for handsfree devices; MicroSD card slot; access to personal and corporate email Up to 4 hours of talk time, up to 240 hours (10 days) of standby time