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An LAPD helicopter claimed to have ID'ed protesters from above and threatened to "come to your house"
(www.motherjones.com)
This is a most excellent place for technology news and articles.
Having a small faraday bag around is useful too, that's what I do.
I wouldn't trust a foil bag to do anything 100%.
the only 100% way to not be caught is not bring it.
it also provides an alibi. "see, my phone was here all day long."
I mean, a proper Faraday cage will block anything unless the US government has figured out how to break the laws of physics...
A proper Faraday cage, a truly excellent one, just the most Faraday of all the cages, is easily defeated by physical attacks such as getting your phone cloned when you get mass arrested and summarily released on OR.