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I BT into my car stereo too. Once that initial pairing is done, it will keep the device in a list in both your phone and the car stereo like Zombie said. When BT is set to on, my BB comes up with a prompt when getting in the car each time that says that Pioneer Model X is attempting to connect. Allow? Only if you delete the device info from either unit will you have to go through the pairing and discovery process again.