My twin can use his face for my Face ID?

Lol should’ve bought a iPhone 8 then

Since an iPhone 8 is the only current Apple device that has facial recognition, did you mean shouldn't?

Regardless, turning off one feature does not negate the rest.

It is my understanding that since the iPhoneX doesn't have a home button you must use either Face Recognition and/or a passcode. The iPhone 8 does still have a home button, so you can use face recognition, fingerprint, or a passcode with it. I think he actually did mean should've.

The iPhone 8 doesn’t support FaceID at all. Only the iPhone X has that feature. An iPhone 8 is no different than an iPhone 7 when it comes to screen unlock - passcode or fingerprint.

Since the OP doesnt want his/her twin to unlock their iPhone X with their face, and doesn’t want to enter a passcode, they are saying they should have bought an iPhone 8 instead of an X and used their fingerprint instead.

Disable Face ID.

Turn facial recognition off and use the old method of entering your 6 digit passcode.

If that is indeed the case, then the initial post doesn't make any sense. Without an iPhone 8, his twin can't open an older model via face recognition. So why post the topic at all?

Yes, I meant to say iPhone X. Thank you for the correction.

Which of course means the statement, should've bought an iPhone 8, is correct.

Have you actually tested this and shown that your twin can unlock your phone using face-ID, or are you just assuming they can?