Activated but no o2??

Ok, i was getting all of the error messages - and all of a sudden the activate screen popped up, i went a bit manic - logged into my itunes account and just kept clicking continue. Something i noticed as the screens flew past was my work phone number was showing in the phone number box - and it should have been my new mobile number?

Anyway - anyone got any idea's on how to go back to that page and put in the correct number - at the moment i have an active iphone, but no active o2....