Not sure about the spotify. But I have an Iphone 4, and it will pair itself to the car and use the iPod USB connection for music and navigation. It is pretty cool, and finally, an unlock may come out March 11.
The neat part is that you program an address in Navigon, and use the radio ipod controller to play tracks stored on the phone. When you approach a turn, the phone lowers the music volume and announces the turn! Very nice.
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