Calls and contacts
Apps and media
Cause 1 of 2: Automatic mobile data usage is turned on
If automatic mobile data usage is turned on, your phone will use mobile data when the connection to the Wi-Fi network is poor.
Solution: Turn off automatic use of mobile data.
Turn automatic use of mobile data on or off
Press the indicator to turn the function on or off.
Return to the home screen
Press the Home key to return to the home screen.