iphone – using aux jack in car to play music AND voice calls?

I know theres bluetooth devices out there allowing you to listen to your ipod/iphone music BUT…. i also heard that people can overhead your phone conversations if theyre tuned into the same FM frequency!?! such as someone stopped beside you at a red light, or parking lot.
(examples are Jabra and MOTOROKR)

So.. since my car has an AUX plug in, can i find a wire that plugs into the aux and into my phone?
i want to hear music, and voice calls through my car speakers, without having an extended arm such as this one:

http://farm3.static.flickr.com/2355/2206921565_5fd67cf1b6.jpg

That’s too bulky for me, which is why i was thinking BlueTooth.
But i ALSO heard, you need to shut off/turn on your iphone EVERY SINGLE TIME you get into your car in order to sync it to the bluetooth device, is that true?

any and all suggestions please
=D

I’m looking for this exact same thing, and I haven’t found anything. I think the problem is that while you could certainly easily hear the other person on your speakers, you would need a microphone to pick up whatever you said. So a simple patch cord won’t do the trick, unless you only want to listen but not talk. I guess feedback is also an issue if there was a microphone on the patch cord. (What the other person said would go in the mic and then they’d hear an echo).


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