I have bought a nokia 5800 from ebay which was originally from vodafone but it was unlocked and I am in o2 but there is still everything set to vodafone in the phone like when I start up the phone the Vodafone logo is still there and the internet settings things are still vodafone and the product code for it is still in vodafone 
.... How do I change all of this for o2??!! Please tell me quickly I need a fast answer.
.... How do I change all of this for o2??!! Please tell me quickly I need a fast answer.