Many times you’ll want to start out fresh on your iPhone, iPad, or iPod touch. Other times you need to close out of an app that is eating up the memory or battery life while it’s running in the background. Here’s how to completely close out of apps in iOS device.
Double Tap the Home button. You’ll see a list of apps running in the background at the bottom of the screen.
Now press on and hold down an app until it wiggles — and a red minus icon appears. Tap the red minus icon to close each application.
The apps will restart normally the next time you launch them.