I have just recived my iphone 4s on payg. And im trying to use my mobile data but it says im am not subcribed to a celluar data network. my APN settigns are wap.vodafone.co.uk and wap for username and password. However when i had my 3g i had nothing in the settings...they were blank.I cannot change my settings though.....if i try to change my settings and save them they immediatly change back. I either want to remove all sttings in there or change it so pp.vodafone.co.uk..... someone help me asap please?