Several things can cause problems with internet access. First check that you have an active goodybag and also check that the goodybag still has a data allowance if it is not one with unlimited data. If you do not have a data allowance, check that you have sufficient credit for data. Also check that data connections are enabled on the phone. If all these are okay, delete the settings on your phone and set them up from scratch using the instructions at http://community.giffgaff.com/t5/Unlocking-Discussions-Knowledge/Guide-to-using-an-iPhone-3-4-5-on-g... and then switch the phone off and then on again. Hopefully that will get the internet working again.
If you think my post helped you even 1% please click the ** KUDO STAR** !!! If your query is solved with my inputs please click "ACCEPT A SOLUTION" !!!