I don't have any music on my phone, I stream it from rhapsody. How can I get it to play on my appradio? Thanks

It will play fine. You will not be able to get full touch control, but the appradio can control the basics. 

iPhone 4/4s- As soon as you plug it into the car it will work fine. Just press play on your phone. 

iPhone 5- you need to get past the warning screens. Press on the apps button and then just press ok till you see the warning saying not to drive and play video. At this point the audio from the HDMI is being routed to the speakers. Press play on spotify and you're good to go. 

Android- No Clue. I assume it is the same deal as the iPhone 5 because they use the same interface. I don't have one though so I can't give you a definitive answer. 

Hope that helps.