Hello. My car has built-in bluetooth, so I would like to use it with my iPhone. I also would like to connect my iPhone so I can play my music through the car speakers. I have heard that Apple's Composite AV Cable (MB129LL/B) will work with my iPhone and car speakers. Now my question is... If I am listening to my iPhone using the composite AV cable and I receive a phone call, will I still be able to talk/listen to the phone call through the bluetooth, or will I not be able to speak to the person on the other line because the iPhone is still connected through the composite AV cable? Also, I noticed that the composite AV cable plugs into the bottom of the iPhone. If I choose to purchase a cable that plugs into the top headphone hole, will I be able to use my bluetooth? Thanks.