It's illegal to drive on base while talking on a phone, without a hands free device. I have one bluetooth, but 4 different vehicles, so I NEVER remember which one I leave it in. So I'm driving one day, playing music from my Eris through the car stereo with the adapter cord thing (sorry too tired to think of what it's called). Next thing I know, the music stops playing, and a ringing comes through the speakers. I look at my phone, and decide to select 'Answer'. All of the sudden the voice on the other ends starts talking through my car speakers. So I start talking back. Then I'm like, "wait a second, you can hear me?" Yes was the reply. I say "Loud and Clear????" Yes is the response I get again. So we proceed in a conversation about me being late somewhere, yadda yadda.... So now out of habit, when I get in the car, the first thing I do is hook my phone up to the car stereo. I know for certain that none of my other phones did that. What a cool little trick. Shame on you all for not telling me about it..