[crazygringo]

Genuine question: will identical twins be able to unlock each others' phones?

Or do they actually have enough differences that the phone can pick up on, even if people can't tell them apart?

[codazoda]

They have enough differences.

I've only known one set of identical twins, back in high school, and at first I thought they looked the same. After a while, however, you can recognize the differences. I suspect a phone has enough data points that it sees them as different people.

[xvaier]

During the presentation, they mentioned that if you have an evil twin, you should probably use a passcode, so I'm assuming that the acceptable range for recognizing is larger than the ranges of difference between identical twins.