iPhone SE
Select help topic
Turning data roaming on or off
You can limit your data usage when abroad by turning off data roaming. You'll then not be able to access the internet using the mobile network when abroad. You can still use Wi-Fi even though data roaming is turned off.
Press Settings.
Press Mobile Data.
Press Mobile Data Options.
Press the indicator to turn the function on or off.
Press the Home key to return to the home screen.