Actually, how do I disable roaming data?
@susellin if you don't need data , turn it off completely
To turn Cellular Data on or off, go to Settings > Cellular.
Turn off Cellular Data by swiping the switch with that label to the left.
1 Swipe down from the screen to reveal the Quick panel.
2 Tap the Mobile data icon to deactivate. .
1 Go to "Settings", then tap "Connections".
2 Tap "Data usage".
3 Tap the switch to activate or deactivate "Mobile data".