1 Find "Background App Refresh"
Press Settings.
Press General.
Press Background App Refresh.
2 Turn background refresh of apps on or off
Press the indicator next to "Background App Refresh" to turn the function on or off.
3 Turn background refresh of specific apps on or off
Press the indicator next to the required app to turn the function on or off.
4 Return to the home screen
Press the Home key to return to the home screen.