Per the service info technik, in my 2004 Turbo there's a powered cell antenna built into the rear spoiler (along with the radio and gps antennas). How do I access this antenna for my phone? I know there's no bluetooth, but I'd love a powered cellphone cradle that hooks to the spoiler antenna.

 

To my knowledge, that is for the optional built in telephone module if your Cayenne came with it. I don't think you can use it for a standard cell phone.