[rtribble]

I'm not sure I totaly understand your queston on voice comand, but first (of course) you have to regester the different voice comand names for each number you want. When you push the "icon with face and waves" it will voice prompt you after which you give the voice comand "dial by name". It dosent matter where your Map/etc is as when you push this icon it will automaticaly go to voice comand mode and prompt you for input. After this it is simply a matter of folowing the directions as they are given through voice prompts. One thing- be patient enough to let the full voice prompt to complete the instruction before giving your voice camand.
As far as the clear bra, I too am consideringtrying to install one myself as I've not located a creditable installer in my area. Do a search on this site and you will find a few who have some experience in this area but I recently posted an inquiory and got little response.