You can use stereo bluetooth headset like one from BlueDio i.e available for Rs. 650 from Palika Bazaar, New Delhi or online somewhere on internet. Connect that to AUX port using AUX cable. This one is basic. You can use 12v to 3.3v converter to power it up permanently and can use FM Transmitter available in market to hide it somewhere in car. Use AUX port of FM transmitter if you have ACTIVE 2012 (as I have tried but unable to enable AUX in menu). Additionally use USB extension cable to use FM Transmitter for Pen Drive use. I know that this explanation is unable to understand but if you got the idea then you can ask questions.