Yes. I have the DNX8120 in my car. First of all, in order to use your iPhone bluetooth feature you must turn your WIFI OFF. This prevents interference.
Bluetooth audio for music transfer is not compatible with iPhone. You can transfer music via a cable made by kenwood; Model KCAiP300v, which will work for audio only, not video.
Also, Bluetooth display of the SMS messaging system on the DNX8120 is not compatible with the iPhone.
Lastly, the mic should be placed directly in front of the driver up by the headliner. An echo may occur if placed behind the rear view mirror. For best audio, a piece of cloth on the mic.