Your iPhone will recommend certain Settings changes to save your battery life. To see what your iPhone recommends you change:
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Turn Off Raise to Wake on Your iPhone
All models of iPhone have the Raise to Wake function turned on by default (iOS 10.3 or later). To turn off Raise to Wake on iPhone:
Open Settings.
Tap Display & Brightness.
Find Raise to Wake and toggle it off.
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Update All Apps That Are Available to Update
When Apple releases a new iOS update, developers have to play catch-up too. To update your apps:
Open the App Store.
Tap Updates at the bottom right of the screen.
Tap Update All in the upper right corner.
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Reduce the Number of Widgets on the Lock Screen
Widgets allow you to quickly view information that’s important to you in the Today View, but all those widgets take power to keep up to date.To access the Today View from Lock Screen, swipe right from the main lock screen. To access the Today View from the Home Screen, swipe right from the first Home Screen.
To remove widgets you don’t need:
Scroll to the bottom of the Today View screen; tap Edit.
If you started from the Lock Screen, you’ll need to unlock your phone to make changes.
Here you can add or remove widgets.To remove widgets, tap the red circle next to a widget name.
This will reveal a Delete button; tap Delete.
Then tap Done.
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Restart Your iPhone
If you ever have any issue with a device, Apple made or otherwise, a simple restart almost always helps. To restart your iPhone:
Hold down the Side button until Slide to Power Off appears on screen.
Slide to power off the iPhone.
Once off, hold the Side button to power your iPhone back on.
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Turn Off Background App Refresh
Background App Refresh does exactly that—it refreshes your apps in the background, which is to say your apps continue to update even when you’re not using them. To turn off Background App Refresh:
Open Settings.
Tap General.
Select Background App Refresh.
Toggle off Background App Refresh.
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Location Services: Only While Using the App
Lots of different apps want to know and use your location for various reasons, but most of them don’t need to track your location when you aren't using the app. You might want to leave it for, say, a navigation app, but most apps don’t need Location Services on all the time. For most apps, allow Location Services only while using the app. To do this:
Open Settings.
Tap Privacy.
Tap Location Services.
Select individual apps to choose when Location Services can be used.
If the app never needs to know your location to be fully functional, go ahead and select Never.
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Turn On Reduce Motion
Using a lot of animations requires lots of iPhone battery life; in Messages and across the iPhone. Simply switching from an app to Home screen has its own animation. To turn on Reduce Motion:
Open Settings.
Tap General.
Select Accessibility.
Tap Reduce Motion.
Toggle on Reduce Motion.
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To Make it Last: Turn On Low Power Mode
To turn on Low Power Mode, you can activate Siri and say, “Siri, turn on Low Power Mode.”
Alternatively, you can turn Low Power Mode on in Settings manually.
Open Settings.
Tap Battery. Toggle Low Power Mode on.
Pro-tip: Better yet, users with iOS 11 and later can add Low Power Mode to their Control Center to be able to easily toggle it on and off.
Just go to the Control Center tab in Settings and tap Customize Controls.
In the same way you added and removed Widgets from the Today View, you can add, remove, and rearrange your additional Control Center.
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Place Your iPhone Face Down
When your iPhone is facing up, the screen illuminates whenever you receive a notification. And if you receive a lot of notifications, they could easily be part of your battery problem. Stop yourself from being tempted to reply each time a notification appears by leaving your iPhone face down on your desk or side table. Doing this will preserve battery life since your iPhone won’t light up when you receive a notification.
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Turn On Airplane Mode in Locations with Poor Reception
When out and about in a location with poor cellular reception, having your iPhone constantly searching for a cell signal will have your iPhone battery depleting in no time. To prevent iPhone battery drain, open Control Center by swiping up from the bottom of your Home screen and tap on the Airplane mode icon (it looks like a miniature airplane.) Once you're back in an area with a strong cellular signal, use the same steps to turn off Airplane mode.