100% functional. It will NOT come in its original packaging but will include a certified cable and power adapter. Headsets, SIM card and manual are NOT included. This Phone is fully functional with all carrier networks. It does not come with a SIM card, you will need to get one from your carrier of choice. 

Features
Proximity Sensor, Gyro Sensor, Fast Wireless Charging, Infinity-O Display, Telephoto Lens, Geomagnetic sensor, Ultrasonic Fingerprint Sensor, Super Resolution Zoom, Facial Recognition, Wireless PowerShare, Hall Effect Sensor, Accelerometer, Ambient Light Sensor, Barometer, Ultra Wide-Angle Camera, Triple Rear Camera