what do you use for a faraday cage for your phone?  foil i found i could sometimes achieve approximately 90 db attenuation by carefully wrapping the rf generator in foil and double folding the seams on all sides, which is quite good (comparable to commercial pouches). unfortunately the results were extremely inconsistent and difficult to replicate. the same technique that produced 90 db attenuation in one test would produce only 50 db the next time, with no visually obvious differences. it is extremely difficult to reliably obtain a good rf seam, at least with the kitchen-grade foil i used. compounding the problem is that there's no practical way to field test an improvised foil enclosure. you would have no way to tell whether you've managed to fold and seal it adequately well. so despite excellent best case results, aluminum foil appears to be impractical for real-world use. (there's no point in providing a table of measurements here; it would be meaningless). electrostatic mylar bags i got around 7 db of attenuation at a frequency of ghz increasing linearly to 8.8 db at a frequency of 6 ghz. i could not higher attenuation. in no instance did the bag provide more than 9 db of attenuation. if mylar bags are free, in this case, you get what you pay for. not recommended. should i tried a payed option? free stuff isn't working very well.
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