Calls and contacts
Apps and media
Cause 1 of 12: The selected network mode is not available
If you've set your phone to use a specific network mode, it can't get a network connection if the selected network mode is out of range.
Solution: Turn on automatic network mode selection.
Find "Preferred network type"
Slide your finger downwards starting from the top of the screen.
Press the settings icon.
Press Mobile networks.
Press Preferred network type.
Select network mode
Press the required network mode.
Return to the home screen
Press the Home key to return to the home screen.