This guide from Grugq is a great overview for phone privacy and applies even if you have a phone with hardware kill switches for the modem, or a user-swappable modem like in the Librem 5. While those things might make certain steps easier, you still have to keep all the correlation in mind.


Since that article was written there's been additional research on using other sensors (ambient light, gyroscope, etc) for tracking, which is why we implemented lockdown mode in the Librem 5 so you have an option to turn it all off.

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