Unfortunately many people still seem to have problems when trying to use roaming services for some reason and nobody from 48 has ever explained why or provided a guaranteed fix.
As such, the usual generic advice for roaming issues applies...
If your SIM predates January 2023 then maybe get a replacement in case it helps with roaming issues:
It may be worthwhile reviewing these two threads in case any of the suggestions help to avoid roaming problems:
If you still have problems then you'll probably need to contact 48 support for further assistance.
See the links in my signature below.
