Samsung Galaxy Tab A
1 Find "Mobile networks"
Slide your finger down the display starting from the top edge of your tablet.
Press the settings icon.
Press the settings icon.
Press Mobile networks.
2 Turn data roaming on or off
Press Data roaming to turn the function on or off.
If you turn on the function:
Press OK.
Press OK.
3 Return to the home screen
Press the Home key to return to the home screen.