Business Insider has conducted tests on the Face ID unlocking system of the iPhone X with identical twins.
It conducted tests with one pair of male twins, with one of the brothers registering his face to unlock the phone.
The brother whose face was registered tried fooling the iPhone X into remaining locked by wearing sunglasses, a scarf, and a hat, but it unlocked for him every time.
It also repeatedly refused to unlock for his twin.
Mashable also conducted tests with two sets of identical twins, also brothers. In both cases, the iPhone X failed its test.
One pair of twins wear glasses and Mashable had them remove their glasses and attempt the unlock test – with the iPhone X unlocking for the other twin.
Phil Schiller, the senior VP of marketing at Apple, said during the launch of the device that identical twins may be a potential problem for the iPhone X.
“The chance that a random person in the population could look at your iPhone X and unlock it with their face is about one in a million,” he said.