My Sony Xperia XZ2 uses a large amount of mobile data

Slide your finger downwards starting from the top of the screen.

Press the settings icon.

Press Network & Internet.

Press Wi-Fi.

Press Wi-Fi preferences.

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 your finger downwards starting from the top of the screen.

Press the settings icon.

Press Apps & notifications.

Press Configure notifications.

Press Notifications.

Press the required app.

Press the indicator to turn the function on or off.

Press the Home key to return to the home screen.

Press Apps.

Press Play Store.

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

Press Settings.

Press Auto-update apps.

To turn off automatic update of apps, press Do not auto-update apps..

To turn on automatic update of apps using mobile network, press Auto-update apps at any time. Data charges may apply..

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 Auto-update apps over Wi-Fi only..

Press the Home key to return to the home screen.