Why iPhone Face ID stop working

Welcome to the Apple Support Communities.

Depending on your exact issue, see:

• If Face ID isn't working on your iPhone or iPad Pro - Apple Support
• If an alert says Face ID has been disabled on your iPhone or iPad Pro - Apple Support

Jack

Zaddybbf Said:

"Why iPhone Face ID stop working : How can I set my iPhone Face ID to start working if it been disabled"

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Troubleshooting iPhone Face ID and Networking:

I. Troubleshooting Face ID:

A Few Sites to Try:

• If Face ID isn't Working on your iPhone or iPad Pro - Apple Support
• If you can’t Turn on or Sign in to iMessage or FaceTime - Apple Support
• If you can't Make a FaceTime Call on your iPhone, iPad, or iPod touch - Apple Support
• If an Alert Says Face ID has been Disabled on your iPhone or iPad Pro - Apple Support
• If you Experience an Error when Trying to Activate iMessage or FaceTime - Apple Support

II. Troubleshooting iPhone Networking:

How exactly is networking playing a role in your question?

"No Service":

Is "No Service" is shown on the top-left corner of your screen? If so, go here to fix that: If you See No Service or Searching on your iPhone or iPad - Apple Support