In several cases, you have to use a passcode (these parameters also apply with Touch ID):
- After restarting.
- After any 48-hour period in which you haven’t used Face ID to unlock the phone.
- After 6 1/2 days, an four-hour timer starts, and if you don’t use Face ID within those four hours, you’re prompted for a passcode the next time you unlock.
- After five failed attempts to unlock with Face ID.
- After disabling using any technique above not already mentioned in this list.
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