How to turn on/off Roaming mobile data on the mobile device?
Toggling the Roaming Data capability on the Mobile device itself does not have any impact on the Service Profile nor Roaming Profile of a SIM card.
The Data capability can be turned on/off via the Settings menu of the mobile device.
For iOs
Go to Settings > Mobile Network > Mobile Data Options:
Toggle the “Data Roaming” option.
For Android
Go to Settings > Connections > Data usage:
Toggle the “Roaming Data” option
Note:
The Settings menu can differ per type of mobile device and/or version of the operating system of the mobile device, we recommend that you consult the manual of the mobile device for this.