On the navi im sorry to say that the screen is useless without the navigation control module which sits in the trunk as it is this module which supplys the RGB (red, green, blue) video signals to the screen.
On the phone it sounds like the phone in the car is broken. Id try to see if you can have it repaired or maybe try ebay for a replacement. Of course you are correct in that it is an old outdated phone, however I dont think any other phone will integrate into the car and use the in-car features.
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