Going to Portugal soon - do I need to update my sim to roam as was unable to roam last year in Spain
You probably should.
See my recent post on the same issue here:
Yes I got a new one and it worked for data and calls in Portugal . Now I am in France on the Orange network case work but no Internet GRR. When will 48 get this sorted. Another person with me the same.e no data!
Did you check the links in the post that I linked to above just in case there's anything useful there?
If not then you'll probably have to contact 48 support.
See the link in my signature below or email them at email@example.com