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On the other hand, smartphones are invaluable to most activists because they allow you to provide documentation of abuses through its various sensors (audio, video, photos, etc).

A cheap phone that is refreshed regularly will probably be your best bet.

Don't buy it traceably or in the same place, use the same model, use the same SIM, turn it on in the same geographic location, or call the same people!

I'm not sure how much I believe in any counter-surveillance methods anymore that involve a phone. Then again, I'm happy that my life doesn't include the need for that level of secrecy.