Close an app so that it is not running in the background
To optimize the performance of your
smartphone, try to close apps when you are finished with them.
To see which applications are running, press and hold the
key until the application switcher appears.
Click an application icon.
In the app, do one of the following:
If necessary, continue to press the
key until the home screen appears.
How to: Applications
Keep an application running in the background and switch to another application