Ok , Service books are the internal application that connects the blackberry to the carriers service link.
without going into much technical detail , they give the cell phone the details needed to link and load the email and other applications like web browser. It supplies the xxx8220; addressxxx8221; and other necessary info. What you end up seeing is the email icons and browser icons. You can login to their site and usually there is an option to resend service books to the phone. Ixxx8217;m not sure of the web site for O2 but if it anything like att it may be something like this https://bis.na.blackberry.com/html?brand=mycingular
You will need to call the carrier is you do not know the web address unless someone else can give the address here.
Everyone sees the responses to the posts so there is no need to repeat.