iOS 9’s battery saving Facedown Detection feature: Everything you need to knowIn case you went through iOS 9’s release notes, you may have noticed it includes a new feature called Facedown detection. The feature along with other refinements helps in improving battery life by an additional hour as it turns off the display when not in use.
So one of the top iOS 9 tips and tricks is to put your iPhone facedown to ensure that the display doesn’t light up when you receive a Notification, which in turn helps in improving battery life.
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iOS 9’s battery saving Facedown Detection feature: Everything you need to know