Use iPod touch to connect phone to car stereo I have a iPod touch 4, paired to Boss 758DBI in-dash car stereo. Why can't I use Bluetooth on iPod to pair my phone?

Would like to do this so that I can have a handsfree conversation through my car stereo.
My iPod has a built-in mic and Bluetooth and a dock in my car.
Bluetooth devices are designed to function under certain "profiles". This is what allows a headset to work with Skype versus Bluetooth headphones which might work with iTunes. Apple's iOS uses very restrictive setup with their Bluetooth profiles. Because of this you cannot pair an iPod touch to a mobile phone.

Here is a list of the supported Bluetooth profiles: http://support.apple.com/kb/ht3647