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If your phone uses a large amount of mobile data, there may be several causes of the problem.
Slide your finger downwards starting from the top of the screen.
Press the settings icon.
Press Connections.
Press Wi-Fi.
Press ADVANCED.
Press the indicator next to 'Smart network switch' to turn the function on or off.
Press the Home key to return to the home screen.
Press Notifications.
Press the indicator next to the required app to turn the function on or off.
Press Play Store.
Slide your finger right starting from the left side of the screen.
Press Settings.
Press Auto-update apps.
Press Auto-update apps over Wi-Fi only to turn on the function.
Press Do not auto-update apps to turn off the function.