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It doesnt use the built in car bluetooth. It uses the bluetooth in the phone to connect with a bluetooth elm327 obd plug. Get the blutooth obd plug from ebay for less than 10 dollars. A cable connection may give quicker communication but you will then need the cable and an otg adaptor to connect usb to your phone.
App is also available on iphone but you need a wifi elm327 rather than bluetooth.
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