Face ID stopped working after getting wer
My phone got wet and the Face ID was unable to recognize my face
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The phone will probably need replacing.
You should arrange a service.
https://support.apple.com/iphone/repair/service
Anything other than Screen or Battery may be a replacement phone and the price is in the article, depending on your warranty or AppleCare+ status.
You can see additional service information within the following article:
Get your iPhone, iPad, or iPod touch ready for service - Apple Support