It seems that your car stereo thinks that the phone is off the hook and that you are using it. Probably in the wires is a pair of wires that need to be connected together in order to simulate an on hook condition. In order to see which of these wires are the two, you will need a schematic or wiring diagram. DO NOT start shorting wires together until you get the desired effect. You will almost certainly fry something if you do. If there are only two wires total then you might try connecting them for just a moment while the display reads "phone" and see if the message goes away. Good luck.
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