Ok I hope this helps some people out cause I was very frustrated when I hooked up my new (iphone 3gs) to my included pioneer cable that came with my f90bt.
I went in my car and connected my phone to the cable and even though the music worked it said something that it will not charge it (a big triangle looking sign). Well I tried disconecting it and putting it back on and it still didnt work so I gave up.
Well Last night before I left my house I brought the iphone included usb cable that you use to hook it up to the computer and it charged the phone so I was like cool well at least