I am trying to figure out what to do here... my blackberry 8130 pearl is connected bluetooth, when I am in the car with someone I want to talk through the phone and not through my speakers. When I switch my phone to "handset" it goes through the phone, but if I turn the music part of the radio back on, it disconects my car with the person.

Why is that?

With the Blackberry's anyways, you are still connected through Bluetooth even if you change to the headset, so when you change out of the Bluetooth, it hangs it up. Now, if you hit the disconnect Bluetooth, it should transfer the call to the headset, but there may be a 10-20 sec delay in between the swap over.