Based on experiences until now, it seems that the older the phone with bluetooth the better it works with Seat Bluetooth system. E.g. if you like Nokia phones and you want SIM phone book visible in the dash and ringing through car loudspeakers and no disconnection/reconnection of bluetooth with annoying "ta-daa" and break in your music listening, go get a phone model which is based on S40. The new S60 phones like Nokia N95, the connection breaks up after couple of minutes and then it starts breaking up/waking up every 15 seconds or so. And you can not get the phone book.
The phone book you can not get from these more advanced phones because they require 16 digit passcode for bluetooth pairing before they allow access to phonebook so that it is little bit more difficult for anyone to sneak your contacts.
I think Seat should provide such BT that the user can give the passcode in initial pairing of equipment instead of using silly preconfigured 4-digit passcode.
Does anyone know if there is possibility to change the length and contents of the passcode in Seat BT? Is there software update available for the radio/bt system of the car?