iPhone’s Face ID security feature gives your thumb a break by using the device’s front-facing camera to grant access to your phone and Apple Pay instead of a passcode or fingerprint. Face ID issues appear when you try to unlock your phone. You may or may not get a prompt to enter your passcode.

Since Face ID uses both software and the camera, either one could be the culprit if it’s not working properly. There are a few things to check when troubleshooting, but some possible reasons include:

Apple also has several features that thwart Face ID to keep your device more secure. The following circumstances will cause your phone to ask for your passcode, but none of them mean the feature won’t work.

Since Face ID issues can stem from a variety of sources, you’ll need to try a few different solutions to get it working again. Here are a few things you can try.