I have an iPhone 4S and just recently got and installed the Pioneer AVH-P6300BT in my car. On Pioneer's website, there is a pdf that lists all the devices supported by the radio, and iPhone 4/4S is listed. I can not for the life of me, get this radio to accept my phone. It always errors out. I used a friend of mine's 4S and got the same results. When I tried my father's iPhone 4, it worked just fine. Is there something I need to try, or something I'm doing wrong? Or does anyone know if this radio does not work with the iPhone 4S as advertised?