Apple highlights that an iPhone — and presumably other iOS devices — will use light and proximity sensors to determine whether it's laying face-down, and stop the screen from turning on even when notifications come in.
It does not seem to work on my iPhone 6. Do I have to enable low power mode for this to work?
The motion coprocessor setting are what govern this battery saving option.
Settings > Privacy > Motion & Fitness > Fitness Tracking
On setting allow the motion coprocessor and proximity sensors to shut off the screen if they detect a face down orientation.
You can test the sensors by checking motion in the health app for step count (for instance) and by making a call and testing the proximity sensor turning off the screen when it is covered.
See this nice article for more information: http://www.iphonehacks.com/2015/09/why-facedown-detection-feature-in-ios-9-doesnt-support-iphone-5-iphone-4s-ipads-and-ipod-touches.html
Yes. You should enable low power mode for it to work
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