This is out of curiousity, but I bought a Griffen PowerJolt recently on the cheap, and to my surprise, it worked with my iPhone 3GS in my 2002 Honda Accord. However, I tried using it in a different older car (I think it's a 1996 Dodge Caravan) and all of a sudden, I got the "accessory not made for this iPhone" message. And, of course, I put it back in my Honda and it again worked fine. Anyway, my question is why is this? Can an accessory be car specific? Thanks.