So you upgraded your phone. Say from iphone 4 to iphone 5 and you try and sync it to your Mustang and it is not showing up. Don’t worry its a simple procedure. First you must go to your sync settings in your car then use the right knob to find the “Delete Device” option push your right knob button and it will ask to confirm. Then scroll to Sync and press OK it will give you a PIN number. Enter this into your bluetooth phone. Set your phone to primary and download your new phone book if you want.