Samsung Galaxy Gio S5660 Android Smartphone (GSM Factory Unlocked) - 3.2" Screen, 3G 900/2100 MHz, 3MP Camera, GPS, Bluetooth - Black Quad Band 2G, 3G HSDPA 900/2100 MHz 3.2" Touch Screen, 800 MHz CPU, Android OS 278MB RAM, 158 MB ROM, up to 32GB with SD card 3.15 MP Primary Camera, No Face Camera / LED Flash 1350 mAh Battery, Blue Tooth, GPS, WiFi, USB, Stereo FM Radio, MP3/MP4 Player 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.