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Originally posted by Nucleardiver
A Faraday cage would protect the phone but don't expect to have any service after the EMP. Unless the towers, lines, and servers are all caged and protected it will all be fried.
To protect your phone just to use downloaded content simply take a military ammo box, insulate it with rubber such as from a semi truck mudflap on all 6 interior sides so there's no chance of exposed metal, and you have a Faraday cage.
It might be better to back everything up to some micro SD cards periodically, and keep them shielded (saran wrap and tin foil should work for that purpose, correct?).