Did You Know iOS 12 Lets You Add a Second Person to Face ID?
Touch ID lets users register up to five fingers that can unlock an iPhone which has long been a boon for those who share access to their iPhone with trusted family members. However, users of the iPhone X haven’t been able to give a second person Face ID-based access forcing those people to wait for Face ID to fail and then tap in a passcode manually.
iOS 12 lifts that limitation allowing a second person to register their face with Face ID on the iPhone X and the new iPhone XR, XS and XS Max. To set this up, go to Settings > Face ID & Passcode. Enter your passcode and tap Set Up an Alternate Appearance. Then give your iPhone to the person who should have access and have them follow the simple setup directions.