Is the problem specifically with data access - i.e. can you make/receive calls and send/receive texts OK or not?
If the problem is with data access then review this thread including the generic settings, settings for your phone or one that is similar and my first post in the thread about the Tweakker APN app which may help.
http://community.48months.ie/t5/Need-Help/Internet-Settings/m-p/78#U78
If you still can't get data/internet access working then log a support query to get 48 to advise:
http://community.48months.ie/t5/Need-Help/How-to-get-help/td-p/4038/jump-to/first-unread-message
Hope this helps.
