Thank you for your e-mail
Unfortunately Mobile web is not available for customers on the prepay base, the service is only available for customers with a post pay contract.
The GPRS data services which are available for prepay customers are WAP and MMS, and to use the Web services you will have to purchase a post pay contract, details can be found by logging onto www.o2.co.uk or by visiting your local O2 retailer.
If you have any further queries, please do not hesitate to contact us, we will be more than glad to help.
Kind regards
Brian
O2 Data Support