if a phone is a possible source, but you cant do without it, what about removing the battery ?
David Penna

Hey David, sorry I just saw this. Yes removing the battery would make sense though that is very hard to do with certain phones like iPhone. In such as case, powering it down and using a cellphone blocking bag to great a faraday cage, would make more sense. Or I guess you can always improvise by wrapping in tinfoil :).

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