Well, when you go to the name in your phone book, and you EDIT the entry, isnt there an option that allows you choose which picture shows up when that particular person calls? If the options are similar to the v600, thats how I would think you do it, cuz thats how I set mine up.
How do you like the phone so far? I am upgrading next month and was thinking of getting the v635. Im indisisive between that one and the v710.