The most common hardware problem is that it is flooded or broken, which can be observed by the naked eye. If there is fog or water droplets in it, it means it is flooded. What we can do at this time is to wait for the steam to dry naturally. If geese can still be used after drying, they can survive. If it doesn't work, you can only go to Apple for after-sales maintenance.

Again, although Apple's mobile phone is waterproof, it can't guarantee that it won't get water, and the official doesn't guarantee that it will get water. There is something wrong with the hardware. If your Apple phone has changed its screen or its makeup has changed a lot, it may also make the face id unusable. This requires us to enter the system and re-enter the face to solve this problem.

relevant information

The first is the input animation of Face ID. When Face ID 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 Face ID reveals more contents. Face ID can not only unlock the iPhone, but also change the password to shop in iTunes and App Store. This completely replaces the fingerprint identification of touch ID.