Are calls and texts working? Are you on a Guido membership? Is your APN field set to 48months.liffeytelecom.com? If not then edit it to change it to that, save the change, switch airplane mode on and then off and then see if it works. This APN field problem is a common one for people roaming in the EU.
Hope this helps.
I am not a 48 employee so if you need to contact 48 support then use option 3 or the chat facility here.