ok i have got the same problem but i have a V3c.
i am able to connect to the phone and manualy move files (sounds, pictures, videos. not contacts or calenders) from the phone to my Mac, i moved a ringtone that i made and it made it onto the phone. for some reason i cant set it as ringtone because it isnt in the list of ones i can choose! but i can listen to it in the Sounds area of my phone.
and when i open iSync and search for my phone it comes up but its says that, iSync can not connect to the device! why is this and how can i change it?
also when i open Address Book and try to manualy sync it tells to me insert a PassCode, but i have no idea what the passcode is and when i input a random number it says it works but nothing happens!