Ok, so I tested the iPhone and it does work with the Jazzy mountain hookup. You do not need to put it in Airplane mode, however, you can hear a small amount of interference.
However, my hookup is not yet spliced to charge at the same time, so I do not know if that will cause more interference. Once I get it spliced I will let you know.
Also, I tested calling from the iPhone while plugged in and it does not play through the speakers. So if you cord isn't long enough, you will have to disconnect it to use it.