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Android 16 could bring Identity Check to more smartphones
It's working on a OnePlus 13 running the Android 16 beta.
When enabled, Identity Check requires biometric authentication to view or modify certain sensitive parts on your Android smartphone. For these actions, biometric authentication is mandatory outside of trusted locations with Identity Check enabled — a password, PIN, or pattern won't work as an alternative. This is because Identity Check eliminates the PIN/password/pattern fallback, which is part of biometric prompt code that can't be changed with a basic update.
Or read this on Android Central