i have a pioneer head unit in my truck and since the ios4 came out i havent been able to get the bluetooth audio stream to work, thats on my 3g and new iphone 4. the cell portion still works. last time i tried to plug my 3g into the stero via cable it said "No Songs" even though there are over 400 songs on there. going to try the iphone 4 here shortly plug directly into the radio and see what happens.