Face id
whats really weird about my iphone 11 is that 2 of my daughters can unlock the phone with their faces!!! How can that happen?! I thought that even twins can not unlock each other’s phones!
iPhone 11 Pro Max, iOS 13
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If they can unlock your phone and you are worried about it, you should turn off Face ID to unlock your phone. Here is an article from Apple about Face ID.
About Face ID advanced technology - Apple Support
Note the section that says the statistics are not as good for twins and siblings