iOS 9 brought a useful new feature you may not have noticed yet. Known as “Facedown detection”, your iPhone can detect when it’s placed face down and won’t turn the screen on when notifications arrive. This can save a lot of battery power if you regularly receive notifications.

How Facedown Detection Works

RELATED: Everything You Need to Know About Improving Your iPhone's Battery Life

While the technology involved is a little more complex, the tip is simple. When you place your iPhone face up on a table, its screen will automatically turn on each time you receive a new notification on your lock screen. You can glance over at the phone to read the notification without even touching it.

If you don’t plan on looking at your iPhone’s notifications as they arrive, just place your screen face down. You’ll still hear notification sounds and your phone will still vibrate. However, when a notification arrives, its screen will remain powered off. This saves battery power.

Prior to iOS 9, your iPhone’s screen actually turned on every time you received a notification even when it was face down. There was no advantage to putting your iPhone face down aside from not seeing the notifications. The screen would keep turning on, using just as much battery power as if you placed the iPhone face up.

Which iPhones Does This Work With?

RELATED: How to Track Your Steps With Just an iPhone or Android Phone

Like many iOS features, facedown detection doesn’t work on every iPhone. This particular feature works on the iPhone 5s, iPhone 6, iPhone 6 Plus, iPhone 6s, and iPhone 6s Plus, iPhone SE, iPhone 7, and iPhone 7 Plus.

It does not work on the iPhone 5, iPhone 5c, iPhone 4s, and other older iPhones. It also doesn’t work on any iPad or iPod Touch devices.

Facedown detection needs specific hardware because it uses the motion coprocessor, which is also used for your iPhone’s step tracking feature. In fact, it only works if that feature is on. If you head to Settings > Privacy > Motion and Fitness and disable the “Fitness Tracking” feature, facedown detection will stop working and your iPhone will turn on its display every time it receives a notification, even if it’s set face down on a surface.

This feature was introduced alongside Low Power Mode in iOS 9. Like Low Power Mode, it’s designed to help save battery power. But it will only save battery power if you know about this tip and choose to set your iPhone face down instead of face up when you don’t need to look at the screen.

Image Credit: iphonedigital

Profile Photo for Chris Hoffman Chris Hoffman
Chris Hoffman is Editor-in-Chief of How-To Geek. He's written about technology for over a decade and was a PCWorld columnist for two years. Chris has written for The New York Times and Reader's Digest, been interviewed as a technology expert on TV stations like Miami's NBC 6, and had his work covered by news outlets like the BBC. Since 2011, Chris has written over 2,000 articles that have been read more than one billion times---and that's just here at How-To Geek.
Read Full Bio »