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Some applications aren't ended completely when you return to the home screen. If you don't end them from the list of running applications, they keep running in the background which may slow down your phone.
1. End running applications
Slide your finger slowly upwards starting from the bottom of the screen until the list of running applications is displayed.
Press and hold the required application.
Press the end icon next to the required application to end it.
2. Return to the home screen
Slide your finger upwards starting from the bottom of the screen to return to the home screen.