Blue tooth in most cars allows you to sync with the car stereo. And for some cars like the TL you can voice dial preselected #s through the nav voice recognition system. Pretty cool. eseentially it mutes your stereo when you get a call, you see caller id on the dash and you can answer or ignore. If you answer it comes through the car stereo. and there is a mic set somewhere. So your blue tooth enabled phone can go anywhere like the glovebox or back seat and still work. For dialing out you voice dial.
A cell phone can have two difference Bluetooth profile, "handsfree" or "headset" profile. If your phone have only "headset" profile it will not work with most factory Bluetooth. If it has "handsfree" profile the chance of it working is greater. A "headset" profile basically just let you pair a phone to a headset, a "handsfree" profile will let you transfer contact, ect.. to the vehicle Bluetooth system. You can always go aftermarket like Parrot or Sony Ericsson, ect... and it's a better chance of all Bluetooth phone working.
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