Samsung DoubleTime I857 Unlocked GSM Phone with Android 2.2 OS, Multi-Touchscreen & TouchWiz UI, QWERTY Keyboard, 3.15MP Camera, GPS, Bluetooth and microSD Slot - White/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. TFT capacitive touchscreen + Secondary capacitive touchscreen (with multitouch) and TouchWiz UI 3.15MP (2048 x 1536 pixels) with Autofocus and Geo-Tagging; Video: QVGA; HTML, Adobe Flash Android OS, v2.2 (Froyo); GPS with A-GPS Support; Bluetooth v3.0 with A2DP 260 MB, 256 MB RAM, microSD card slot for expandable memory up to to 32GB Unlocked cell phones are compatible with GSM carriers like AT&T and T-Mobile as well as with GSM SIM cards (e.g. H20, Straight Talk, and select prepaid carriers). Unlocked cell phones will not work with CDMA Carriers like Sprint, Verizon, Boost or Virgin.