My Sony Xperia 1 uses a large amount of mobile data

Slide two fingers downwards starting from the top of the screen.

Press the settings icon.

Press Network & Internet.

Press Wi-Fi.

Press the indicator next to 'Use Wi-Fi' to turn on the function.

Press Wi-Fi preferences.

Press Advanced.

Press the indicator next to 'Auto network switch' to turn the function on or off.

If you turn on the function, press ENABLE.

Press the Home key to return to the home screen.

Slide two fingers downwards starting from the top of the screen.

Press the settings icon.

Press Apps & notifications.

Press See all ‹› apps.

Press the required app.

Press Notifications.

Press the indicator next to 'Show notifications' to turn the function on or off.

Press the Home key to return to the home screen.

Slide your finger upwards starting from the bottom of the screen.

Press Play Store.

Slide your finger right starting from the left side of the screen.

Press Settings.

Press Auto-update apps.

To turn on automatic update of apps using mobile network, press Over any network.

If you turn on automatic update of apps via mobile network, your apps are automatically updated via the mobile network when no WiFi networks are within range.

To turn on automatic update of apps using WiFi, press Over Wi-Fi only.

To turn off automatic update of apps, press Don't auto-update apps.

Press DONE.

Press the Home key to return to the home screen.