Device Guides
Apple iPhone 4
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iOS is the operating system software installed on your iPhone. To find out which version you have: Tap Settings, Tap General, Tap About, and view the version number.

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How to
Ending active applications on my mobile phone
Some applications aren't ended completely when your mobile phone returns to standby mode. They keep running in the background unless you end them from the list of active applications.
Tap the Home key twice.
At the bottom of the display a list of active applications is displayed.
Tap and hold any menu item until the menu items start to jiggle.
Tap - in the top left corner of the required menu item to end the application.
Tap the Home key to return to standby mode.