iOS 12 allow you to add second person to your iPhone’s Face ID recognition as alternate appearance. Follow these steps to add alternate appearance on iPhone.
- Open Settings app.
- Scroll down and select Face ID & Passcode.
- Enter your passcode.
- Tap on Set Up an Alternate Appearance.
- Tap on Get Started at the bottom.
- Go through the Face ID scan process.
- Tap Done at the bottom once complete.