Sometimes the handset has been configured to disallow access to roaming data. This can be different per device - check with the handset manufacturer for a complete guide on what options are available  Most commonly, we have:  - Apple: https://support.apple.com/en-us/HT201643#:~:text=In%20the%20Settings%20app%2C%20tap,Turn%20off%20Data%20Roaming.  - Android: Open your Settings app and tap Network and Internet or Connections. Depending on your device, these options may be different.