iPhone Face ID randomly stopped working

My Face ID worked perfectly, until some hours ago, when I was going to turn on my phone, it didn't let me use Face ID, and instead of saying the usual message of "Passcode is required to use Face ID", it said "Face ID isn't available, open settings for more information". When I opened settings, it redirected me to the "Parts & Service History" part, but nothing showed up (except my battery, but that is because the battery health is low). I restarted my phone, but it said the same thing. I decided to reset Face ID, and then it didn't let me create it again. I restarted my phone again, and went to set it up. It let me until the camera showed up, then the menu for Face ID creation closed and it (again) told me there was a problem with Face ID. Some minutes ago, I went again to the parts & service history, and Face ID showed up, with the title of "Face ID issue", and a subtitle of "There's an issue with your iPhone's abilty to use Face ID". Is there a way that I can fix this?

iPhone 11 Pro, iOS 18

Posted on Mar 15, 2025 4:30 PM

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Question marked as Top-ranking reply

Posted on Mar 16, 2025 11:25 AM

See the reply from H1290, but also you mentioned that the battery health is low. The camera uses a huge amount of energy, and, if the battery is failing, it can prevent the camera from operating. So there’s a chance that having Apple replace the battery will fix it→iPhone Battery Replacement - Official Apple Support. But note that ONLY Apple can reactivate Face ID if this is the problem; 3rd party shops do not have the tools to do that unless they are Apple Approved Service Providers for iPhones specifically.

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Question marked as Top-ranking reply

Mar 16, 2025 11:25 AM in response to Javiitooo_

See the reply from H1290, but also you mentioned that the battery health is low. The camera uses a huge amount of energy, and, if the battery is failing, it can prevent the camera from operating. So there’s a chance that having Apple replace the battery will fix it→iPhone Battery Replacement - Official Apple Support. But note that ONLY Apple can reactivate Face ID if this is the problem; 3rd party shops do not have the tools to do that unless they are Apple Approved Service Providers for iPhones specifically.

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iPhone Face ID randomly stopped working

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