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So, with Face ID, can you prevent someone trying to compel you to unlock your device by simply closing your eyes or looking away?

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Yes. If you have time to do it, also press 5 times on the on/off button, it disables Face ID and forces entering the PIN. It's an iOS 11 feature, I just tried on my iPhone 6 and it disabled Touch ID.

That was the way it was described in the Keynote

How do you know when to open your eyes again?

You can open your eyes but not look at the phone.

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