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Interstingly, my cousin, a visually impaired 25 years old girl, never liked using the screen off feature. Her argument was that if someone sees her typing on a phone when its screen is off, they would automatically assume that the poor girl doesn't know the phone is off, someone should tell her :)

> Would make sense and save some battery.

Privacy as well: a blind user can not notice that someone is looking over their shoulder.

So yes there is a built-in feature called “screen curtain” which turns the display off. By default it’s a triple 3-fingers tap when VoiceOver is active to toggle.

Yep, the display can be turned off.

https://support.apple.com/en-us/HT201443

I believe you can--maybe she had it on this time for the sake of demonstration?