Some applications aren't ended completely when your phone returns to standby mode, but keep running in the background unless you end them from the list of active applications. Follow these instructions to end active applications.
Step 1 of 4
View list of active applications
Press and hold the Menu key until the list of active applications is displayed.
Step 2 of 4
End active applications
Press the required application.
Step 3 of 4
End active applications
Press the Menu key.
Step 4 of 4
End active applications
Press Close.
View list of active applications
Press and hold the Menu key until the list of active applications is displayed.