I have been wondering about a couple of things. First, Faraday cages protect electronics within them from EMPs, right? So would the metal body of a car act as a Faraday cage and protect the electronics within the car? And I was also wondering... there is a foil-lined envelope I can keep my credit card in to prevent a passerby with a special machine from stealing the info... I wondered if a similar envelope could protect my phone from being located all the time? And maybe that would also protect the phone from EMPs? Note: I am not going anywhere...