Hi All

I just brought a Griffin Powerjolt car charger for my iPhone 3GS (review here http://johnbiehler.com/2008/07/29/griffin-powerjolt-for-iphone-3g/) and i have just tested it in the car and run into a slight issue.

The iPhone 3GS comes up saying something like "this accessory is not made to work with the iphone" then asks if you would like to switch to flight mode. i figured that was normal so just decided to select no and the iphone does start charging...the only problem is that it seems to turn off the sound???

I have switched to using a standard apple usb cable and it seems to work fine but would rather use the griffin one...that way i can just keep it in the car.

Are there any fixes for this problem?