HTC Shift HTCX9501 Unlocked Phone with 40 GB Memory, 3G, GPS, Vista OS, and Wi-Fi-International GSM Version with No Warranty This unlocked cell phone is compatible with GSM carriers like AT&T and T-Mobile Quad-band GSM cell phone compatible with 850/900/1800/1900 frequencies Cellular mini laptop runs Windows Vista OS; slide-out QWERTY keyboard; adjustable 7-inch touch screen; biometric fingerprint sensor 40 GB hard drive; Wi-Fi networking (802.11b/g); GPS navigation; Bluetooth; VGA camera for videoconferencing Up to 2 hours of operating time using Windows Vista