Why is my Face ID not working iPhone X?
Make sure your eyes, nose and mouth are fully visible to the TrueDepth camera. By default, Face ID doesn't work if anything is covering your mouth and nose. If you're wearing a face mask and have already set up Face ID with a Mask*, make sure your eyes aren't blocked.
Can iPhone use X without Face ID?
To unlock iPhone without Face ID or passcode, you can turn passcode off and do not set the Face ID. But it is not safe for your personal information on your iPhone. You can use passcode to unlock iPhone instead of Face ID. Go to Settings and Face ID & Passcode.