Here's what you need:
http://www.therpmstore.com/product_i...36fef626af0cc1
I have this unit in my 04 6S and love it! I mostly use it with my iPod but occasionally with my iPhone. Cool thing about using it with the phone is that if you get a call while listening to tunes on the phone the music volume slowly drops and the phone ring comes over the speakers in your car. I can take calls with it still connected using the speaker phone on the phone. You can change tracks with your steering wheel controls also. This is an easy install! If you have an 04 like me there is a small soldering task that needs to be done on the headunit but all other years this isn't necessary. LMK if you need some help with it.
DD