Since apple doesn't allow apps to directly call service methods using NSURL, I have a contact saved into the users addressbook which can call a service number.
However, if I open the contact (using ABUnknownPersonViewController) I cannot call the service number.
My question: Is there some way I can switch to the address book app and show a contact there? I don't want to tell the user "Open your adress book and search for contact X".
To reply to your question: No, there is no way to open separately the contact address book.
However: You can simply take that number programmatically and use it as you want (also call).