How to Close iPhone Apps Running in the Background iOS4 to iOS8
When too many applications run in the background, they slow down the iPhone and use extra power. By closing these extra apps, users can extend the life of their battery’s charge and enjoy using a faster device. Background applications pile up on the iPhone because the phone does not completely shut them down after use. Instead, the iPhone keeps applications in an intermediate state so they will quickly start should users wish to return to them.


