Hi Mitch42, thanks for the message and sorry to hear that you are having issues with the service.
Can you confirm if you are getting the same issue when turning off the roaming within the handset.
Do you get this issue when trying the sim in an alternative handset? What error are you getting when connecting?
Great to hear it worked Tony 🙂
When you're next away, try this;
Settings > Phone > SIM Applications > Roaming > Mode > Manual > International. If you’re using a newer iOS, then you it will be under Mobile Data instead of phone. Once this has been done you might need to reboot.
Is there anything further I can assist with today?