How to End Background Programs on an iPhone
Apple's iPhone lets users multitask and run multiple apps simultaneously. For example, you can launch the Mail app and check your email, and then open the Safari Web browser, keeping the Mail app running in the background. The more apps running in the background, the more system resources are used. Running multiple apps in the background on your iPhone uses more memory, can cause your device to respond more slowly and can drain the battery faster. Turn off apps running in the background that you don't plan on using to preserve your devices resources.
Press the "Home" button twice, quickly. The "Home" button is located below the screen. A list of currently running background apps appears in a row at the bottom of the screen.
Press and hold your finger against one of the apps along the bottom of the screen until all of the apps start jiggling. A red circle with a "-" sign appears in the top-right corner of each icon.
Tap the "-" sign of an app's jiggling icon to remove it from the list and close the app completely, stopping the app from running in the background.
Swipe your finger to the left across the list of jiggling apps to see more apps running in the background.
Press the "Home" button to stop the apps from jiggling.