For anyone with a Galaxy S3 or other phone that uses the 11 MHL pin spec.  I found an adapter cable from MonoPrice PID 10019, this will fit on your phone with a case on vs getting the Samsung MHL adapter which may not fit on most phone cases, its also about half the price. 

I got mine yesterday and it worked with my X950BH.  I've only had about 20 minutes to play around with the app radio but it appeared that when I hooked it up and I got the appradio application connected everything was good.  Still need to figure out more about appradio in general but this was the missing piece in my setup.

Hi edbe, I currently have the Apple 30pin connector plug into my avic x930bt,  If i buy this adapter for my S4 would this stream video and audio to my HU?  Did you just use a usb cable from your HU to this adapter?

No you have to use a MHL to HDMI adapter.  What this cable does is convert the 11pin MHL Spec of the S3 (assuming other newer Samsungs also use this) to a 5 pin MHL.  This allows the S3 to work with the Android cable set that is sold by Pioneer and older MHL-HDMI converters.

In you case you can just find a MHL - HDMI adapter for your model phone and run the HDMI into your HU if you have HDMI inputs on that model.