Hacker News Reader

Comment by dukeofdoom | Hacker News Reader

Is there a phone case that blocks the phone from receiving any signal. Since my government in Canada has given itself dictatorial powers. Many Canadians might be now traced for peaceful protesting.

View on HN

I think the only safe way is to completely power off the device, or even better not to place it in a location where you want it to be detected at. For example do not carry it. Removing sim or turning on the airplane mode may not help because of various back doors, if any.

See https://www.mattblaze.org/blog/faraday/:

> At least in the frequency ranges I tested, two commercial Faraday pouches (the EDEC OffGrid and Mission Darkness Window pouches) yielded excellent performance sufficient to provide assurance of signal isolation under most real-world circumstances.

Thanks found a few option on Amazon under "faraday phone cage"

Yes.

https://news.ycombinator.com/item?id=29413774

https://www.mattblaze.org/blog/faraday/

If you can remove the SIM, do that. If not, you could try wrapping the phone in two or three layers of aluminum foil, separating each layer by plastic wrap. YMMV.

You can take the sim card out.

Insufficient. The phone will still contact cell towers in order to maintain communication, because even a phone without a SIM can make a 911 call.

Still trackable through the IMEI number unfortunately. Faraday cages are the only answer.

Reply on news.ycombinator.com