Google Pixel 3 XL
My phone uses a large amount of mobile data
Solution 2 of 2: Notifications are turned on
When you turn on notifications, you will be notified about various events such as new email messages, messages from social networks and calendar appointments.
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.