Ok, maybe not brilliant. I've got the auxiliary plug on my R53 stereo head unit. I was driving to California and had my iPhone plugged in and playing music. The phone was in the CravenSpeed scissor mount. The phone rang and it paused the music and the phone rang over the speakers. I answered it as I was trying to change the settings to pick up the phone normally and talk. As I was messing around with the phone I was yelling out to the person on the other end to hold on. Over the speakers they asked why. So I just started talking and they could hear me clearly and I had them in stereo. I now use this as my hands free set. The iPhone has to be in the iPhone setting and not the speaker phone or your hands free setting when it pops up on the call screen. I have the Bose Bluetooth head set and my wife says that the auxiliary set up sounds better than the Bose head set.