The first iOS 17.3 beta rolling out to developers today includes a new "Stolen Device Protection" feature that is designed to add an additional layer of security in the event someone has stolen your iPhone and also obtained the device's passcode. No passcode fallback is available in the event that the user is unable to complete Face ID or Touch ID authentication. In these cases, the user must authenticate with Face ID or Touch ID, wait one hour, and authenticate with Face ID or Touch ID again. The opt-in feature can be found in the Settings app under Face ID & Passcode → Stolen Device Protection. The option will be available on all iPhone models that are compatible with iOS 17, including the iPhone XS and newer.
Source: Wall Street Journal December 12, 2023 21:37 UTC