I have the same issue. My '07 Mustang has an aux jack
that works fine with my iPod, but the jack end of the cable
I bought for the iPod can't be inserted deep enough into
The iPhone receptacle to fully engage.
This is because the iPhone receptacle is too deeply
recessed into the curved surface of the phone casing.
I imagine there is a unique cable available for the iPhone,
but I haven't looked for one yet. For now, I just bring the
iPod along. Still, it would have been nice if the iPhone
jack was compatable with standard aux cables...