Tip: Unlocked for Worldwide use. Please ensure local area network is compatible. click here for Network Frequency of your country. Please check with your carrier/provider before purchasing this item. Notice: This Android/Windows device is designed to function specifically with the current Android/Windows OS installed on it. Any alterations such as upgrades, modding with custom ROMs, rooting or flashing the Android device with other firmware will automatically void the device's warranty. Main Features: QCong Metal 5.5 inch 4G Phablet Android 5.1 MTK6753 64bit Octa Core 1.5GHz 3GB RAM 16GB ROM Fingerprint ID 13.0MP + 8.0MP Cameras IPS FHD Screen Display: 5.5 inch IPS FHD Screen with 401 PPI CPU: MTK6753 64bit Octa Core 1.5GHz GPU: Mali-T720 System: Cong OS ( Based on Android 5.1 ) RAM + ROM: 3GB RAM + 16GB ROM Camera: 8.0MP front camera + 13.0MP back camera with PDAF and LED flashlight Bluetooth: 4.0 GPS: GPS, A-GPS Sensors: Gravity sensor, Proximity sensor, Ambient light sensor, Compass and Fingerprint sensor Card slot type: Dual SIM dual standby, One is Micro SIM card slot, the other is Nano card slot, which can also be used as a TF card slot. Note: Nano SIM card and TF card cannot be used together, beacuse they share the same space of card slot. Network: 2G: GSM 850/900/1800/1900MHz 3G: WCDMA 850/900/1900/2100MHz 4G: FDD-LTE 1800/2100/2600MHz Note: 1. Both SIM1 and SIM2 support 4G networks. You can choose the data service mode in the settings, one SIM will be 4G while the other SIM can only use GSM networks. 2. SIM2 can be used in combination with a Nano-SIM card or a TF card of up to 128GB.