4'' ZTE Open C Firefox OS 1.3 3G Smartphone Qualcomm Dual Core 1.2 GHz Cell Phone Black Android 4.4 KitKat Support 2G network: GSM 850/900/1800/1900MHz Support 3G network: WCDMA 850/1900MHz 2.0MP rear camera, up to 1600x1200 pixels resolution 4.0 inch large TFT capacitive screen with 800 x 480 pixels WVGA screen resolution Can reflash the Android 4.4 KitKat OS. If you are not accustomed to using Firefox OS, please contact us and we will provide you the Android OS firmware.