Just an FYI, but active cell-phone jammers of any sort are illegal in the United States (except for military and law enforcement). However, if you want to put metallic mesh in your walls and over your windows (i.e. a Faraday cage), it is perfectly legal to do that.
Mount one of these with an inverter in the truck of my car please. Too many people ignore the hands free laws, this would just be great. But then too many people would freak out because their phone just dropped their important call to their kid in the backseat and possibly cause more accidents.