October 31st 2017
By Mike Flaminio
In a video, Mashable tests Face ID on the iPhone X with two sets of identical twins. As expected, Face ID unlocks for both siblings.
Both Face ID and Touch ID aren't strong security features. The main security advantage is as a substitute for simple passwords and PINs. Automating authentication makes it more convenient to have strong passwords because it's not a chore having to continuously enter these codes, for example. If you're really concerned about someone spoofing Face ID or Touch ID, it would be best to use a complex passcode on the iPhone.