this post was submitted on 17 Aug 2025
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Privacy
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Why would one want to put their phone in a faraday cage? I know what the cage does, but don't understand why you'd want to use one instead of turning the device off.
Edit: According to this, unless your phone is compromised, turning it off is sufficient.
PDF link: https://media.defense.gov/2020/Aug/04/2002469874/-1/-1/0/CSI_LIMITING_LOCATION_DATA_EXPOSURE_FINAL.PDF
Some phones, even if they are turned off, still send telemetry data.
I use GrapheneOS and for safety reasons, when I know I won't get a call, or if I have to travel somewhere discreet, I'll use one :P Works well for me!
I can't find anything other than redditors making this claim. Is there a better source I can look into?
I can't find any articles on it at this time. However, apple recently made it so that find my works with the phone off. My phone gives me warnings about this when I shut it down.
Here's a pdf link to a 2020 NSA publication on the subject: https://media.defense.gov/2020/Aug/04/2002469874/-1/-1/0/CSI_LIMITING_LOCATION_DATA_EXPOSURE_FINAL.PDF
It seems that powering the device off is sufficient unless the device is compromised.
Right, but if it's compromised what's a faraday cage going to do? As soon as you remove it from the cage it'll reveal your location.