My mobile phone uses a large amount of mobile data
If your mobile phone uses a large amount of mobile data, there may be several causes of the problem.
If notifications are turned on, your mobile phone will use mobile data when applications send push notifications and is not connected to a Wi-Fi-network.
Solution: Turn notifications on or off
If GPS position usage for applications is turned on, your mobile phone will use mobile data when an application uses GPS to determine your position and is not connected to a Wi-Fi-network.
Solution: Turn GPS on or off
If automatic update of apps via mobile network is turned on, your mobile phone will use mobile data.