In a video posted to Reddit on Friday (Nov. 3), two brothers demonstrate that they can both unlock one brother’s new iPhone X using its Face ID facial recognition security option.
“We are not twins. He is five years younger than me,” the older brother and owner of the iPhone X says. They both wear similar glasses. When his younger brother tries to unlock the phone without his glasses on, it doesn’t work. But when he slips his glasses back on, the iPhone unlocks.

IPhoneX Face ID fail? from iphone

A second video to investigate why that happens. Apparently it seems that everytime you unlock the phone using a pin code, it captures your face again. In this case, it seems to have created two samples of the face, the elder and the younger brother. Thus both can unlock the phone.

By Harry