upgrade a base gl450 to a premium package

[alisuta]

Having an non premium gl450, is there anything that can be done to put some of the aftermarket premium packages? Example: phone communication. I asked my dealership and they are saying that my car is not wired for phone communication, than why do I have the stereo with all the dial numbers? Any help...

[asianml]

iirc, the dial numbers double as radio functions as well (choosing station, etc.).