GOgroove SMARTmini BT ADVANCED Wireless In-Car Bluetooth FM Transmitter with Charging, Music Control and Hands-Free Calling for ANDROID, iPhone, Blackberry and Windows Smartphones
I've owned other GOGroove products and had great success.  This is no exception.  Just hooked up iPhone-effortless, sounds great and phone calls sound just like the Bluetooth integration in our other vehicle.  This is a great product.  Certainly beats installing a port or transmitter in dash.  Give this a try.  You won't be disappointed.