I just tried my iPhone 3G in my car after updating it to 2.2.1.
I have a Sony car stereo which has a 30-pin iPod dock connector on it and previously it would not be able to recognise the iPhone or the music on it.
I'm not entirely sure whether the issue I was having was resolved in an earlier version but I know for sure now that my Sony car stereo can control my iPod and read everything from it properly now that I am updated.
Unfortunately Apple removed the FireWire charging pin from iPhone 3G (and the modern iPods) so charging is not possible any more, but at least I can play my music!
I have a Sony car stereo which has a 30-pin iPod dock connector on it and previously it would not be able to recognise the iPhone or the music on it.
I'm not entirely sure whether the issue I was having was resolved in an earlier version but I know for sure now that my Sony car stereo can control my iPod and read everything from it properly now that I am updated.
Unfortunately Apple removed the FireWire charging pin from iPhone 3G (and the modern iPods) so charging is not possible any more, but at least I can play my music!