Do you have a Guido membership?
EU roaming only works on that membership and not any other.
If you do have a Guido membership...
What make and model of phone do you have?
Is it an iPhone by any chance?
If it is then this might be of relevance - if it is then you may have to try that tip many times before it works so be persistent. (Blame Apple for this sort of stupidity).
If not can you do a manual search for networks and connect to a local one at all?
If necessary contact 48 support for more advice - see the link in my signature below.
Hope this helps.