What membership do you have? What country are you in? Do calls and texts work? If so then check your internet settings and if the APN field has changed from 48months.liffeytelecom.com then edit it, change it back to that, save the settings, reboot the phone and see if data starts working. This assumes that you're roaming in the EU on a Guido membership. If not the data will not work at all anyway.
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.