I've never had any problems connecting my LG Optimus V with any Bluetooth headsets or my MacBook Pro laptop. Today, I ran into a problem connecting with a Pioneer car stereo - the DEH-6400BT. I was able to play music from the Optimus V, but i wasn't able to use the phone via Bluetooth, which was my primary reason for getting this new stereo. I can't access any of the Bluetooth phone features - I didn't hear the phone, nor was I able to access the phonebook. I was able to connect the car stereo with someone else's Android phone to use the phone features, so it looks like it's a problem with the LG Optimus interface. i installed A2DP Volume from Google Play, but that was fairly useless. I sent a message to LG, and received the message "Please contact the stereo manufacturer for compatibility information." I'm waiting for a message from Pioneer. Any suggestions would be greatly appreciated.