1 Find "Mobile networks"
Slide two fingers down the display starting from the top edge of your phone.
Press Settings.
Press Settings.
Press More....
Press Mobile networks.
2 Turn data roaming on or off
Press Data roaming to turn the function on or off.
If you turn on data roaming:
Press OK to confirm.
Press OK to confirm.
3 Return to the home screen
Press the home icon to return to the home screen.