Did it work before now and just stop working today?
Did anything change on your phone - e.g. software update or settings changes?
Have you tried switching off, removing the SIM, gently cleaning it, reinserting it, switching on and manually scanning for and connecting to 48?
Any difference?
You could try putting a small amount of cash credit on your phone in case (for some reason) it needs the usual Apple iPhone reactivation (some stupid process that Apple insist on with some networks) which involves it sending a UK SMS (costing 25c).
If all else fails then you might need to contact 48 support:
http://www.48months.ie/help#ask-a-48-agent
Hope this helps.
