Phone charging cables for iPhone 3G and Motorola Razr V3
 

I have a 2009 Mercedes SL550 and an iPhone 3G. The bluetooth cell phone connection works perfectly, but there is no uncluttered way to charge the phone. The connector in the center console fits an iPod, and the plug fits the iPhone, but you get a message that it is not compatable with this device (Phone), so it doesn’t charge.
Also, does anyone know of a connector that will charge a Motorola Razr from this outlet in the center console?