Cause 1 of 3: Data roaming is turned off
To use the phone's internet connection when abroad, data roaming needs to be turned on.
Solution: Turn on data roaming.
1 Find "Data roaming"
Slide two fingers downwards starting from the top the screen.
Press the settings icon.
Press More.
Press Mobile networks.
Press Data roaming.
2 Turn data roaming on or off
Press the indicator to turn the function on or off.
If you turn on data roaming, press OK.
3 Return to the home screen
Press the Home key to return to the home screen.