I just got a Motorola T505 for my droid. I only got it to listen to music through my stereo. I'm not very comfortable with my calls going out on an FM signal (that and I hear it's not a full duplex speakerphone). I'd like to auto-disable BT when I get a call. Is this possible with any apps? I see many that turn it ON when you get a call, but none that turn it off.