My wife's iphone 5c works through the USB for music on the phone and pandora/spotify. She can plug in the phone to the usb and control all audio right from the truck Stereo.
But my Samsung S4 won't work at all. Just through Bluetooth and that is kind of flaky too. I have tried to change the settings on the USB connection in the phone when I connect it. I change it MTP and still doesn't work.
I don't think its the truck because my wife's phone works and USB thumb drives work with music also.
I even just bought a new head unit for my Car. 2014 Pioneer x8600BH that claims it works directly with Android through USB with MTP....
Wrong! It doesn't work with my freaking S4! Why is it so hard for Samsung to work through USB with other devices?!