Came across this as a recommended device. It pairs with your phone (doesn't have to be Samsung, CNET tested with an iPhone), and then connects via 3.5mm jack to your cars AUX-in jack for streaming music and answering calls (without touching your phone). Not as great as the premium bluetooth integrated setup, but nowhere near as expensive either.
Samsung Stereo Clip-On Bluetooth Headset for Samsung Review - Headsets - CNET Reviews
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