Pressing the Home button on your iPhone SE does not stop your current app. Instead, it remains open in the background. If an app ever bugs you or you don't want it to run in the background, close it to stop it completely. This is also useful if your app switcher gets too cluttered and makes it difficult to switch between apps.
You may already know how to open the app switcher, also called multitasking interface, on your second generation iPhone SE. All you need to do is quickly double-click the home button, either on the home screen or in an app. Once you do that, all running apps will appear on the screen, in the order in which they were last used.
From the switcher, find the app you want to quit and swipe up on the map. The app's card flies from the top of the screen and iOS will successfully "kill" it. (Tip: You can use one finger per card to close multiple apps at once.)
Interestingly, Apple recommends only force closing when an app is not working properly. If you quit apps in an attempt to conserve battery power, it probably won't help. You can extend battery life by closing an app and forcing iOS to reopen it, instead of letting iOS only process apps running in the background. If you are looking for ways to save battery on your iPhone, check battery statistics.
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