Method 1: Restart the phone. Suddenly, there is a problem that face ID has been deactivated. It is recommended to restart the phone first, which is likely to be solved.
Method 2: Recall whether the phone has been dropped, flooded or repaired by a third party, and the problem still exists after restarting the phone. Then please think back, whether your mobile phone has been dropped or soaked in water, because face ID has been stopped. There is a great chance that it is related to these two reasons. If it happens that the mobile phone really falls into the water, you can jump directly to method 4.
If the mobile phone has recently been entrusted to a third-party organization/store for maintenance (especially screen maintenance), it is recommended to take the mobile phone back to the store and ask the maintenance master to help check and solve the problem of face recognition failure.
Method 3: Repainting the system usually means getting AppleStore, and the maintenance staff will help you repaint the system first. Now the number of reserved places in AppleStore is so tight that it is really troublesome to rush to fix it, so I suggest you refresh the system yourself first, and maybe it will be solved.
Method 4: Send for repair If the above three methods can't solve the problem that face ID is deactivated, then it can only be sent for repair. It should be noted that products that need maintenance need to be reserved in advance, and big cities generally need to make an appointment one week in advance, which may not be available. I suggest you arrange your time reasonably.
principle of operation
The first is the input animation of FaceID. When FaceID recognizes a face during input, it will change from a cool gray smiley face to a blue smiley face.
Secondly, the input method. According to the prompt of iOS 1 1, you must look around in front of the iPhone for a week to complete the face information input.
Finally, the setting interface of FaceID reveals more contents. FaceID can not only unlock the iPhone, but also change the password to shop in iTunes and AppStore. This has completely replaced the fingerprint identification work of TouchID.