HTC S621 Unlocked PDA Smartphone with Camera, Windows Mobile 5.0, Wi-Fi, MP3/Video Player, MicroSD Slot-International Version with No Warranty (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 GPRS/EDGE capabilities Windows Mobile 5.0 Standard platform with enhanced business and enterprise tools; 2.4-inch touch-sensitive screen and QWERTY keyboard Wi-Fi networking (802.11b/g); 1.3-megapixel digital camera with macro mode; MicroSD memory expansion; Bluetooth stereo music Up to 5 hours of talk time, up to 220 hours (9+ days) of standby time