Face ID is the new way on the iPhone X to unlock your phone. This powerful biometric sensor uses a infrared camera, and this is backed up by a dot projector that is used to bean an array of 30,000 invisible dots at the user's face that are used to create a detailed 3D model of the face being captured.

But biometrics can be used against you. Police in the US have compelled suspects to unlock their phones with fingerprints and facial recognition is no different.

Go to Settings > Face ID & Passcode, then enter your passcode. You can enrol you face from here if you choose to use it.

Don't know if you should use it? Read this story.