Privacy advocates got access to Locate X, a phone tracking tool which multiple U.S. agencies have bought access to, and showed me and other journalists exactly what it was capable of. Tracking a phone from one state to another to an abortion clinic. Multiple places of worship. A school. Following a likely juror to a residence. And all of this tracking is possible without a warrant, and instead just a few clicks of a mouse.
Wouldn’t just keeping your phone in a metal box prevent it from communicating with anything? Keep your phone in a metal box and only take it out when you need it. Only take it out in a location that isn’t sensitive. Or hell, just make a little sleeve out of aluminum foil. Literally just wrapping your phone in aluminum foil should prevent it from connecting to anything. A tinfoil hat won’t serve as an effective Faraday cage for your brain, but fully wrapping your phone in aluminum foil should do the job. Even better, as it’s a phone, such a foil sleeve should be quite testable. Build it, put your phone in it, and try texting and calling it. If surrounded fully by a conductive material, the phone should be completely incapable of sending or receiving signals.
You sure it’s still not phoning home? How do you know “off” is really “off” anymore with a modern phone? It’s not like an old flip phone that you can just pop the battery out. Sure it sounds paranoid, but we’re literally talking about something that used to be the realm of crackpots and cranks - “the government is tracking all of us 24/7!” Well, it seems that’s actually literally the case now.
Yes. When your phone is off, it is off.
If you’re paranoid you can buy a faraday bag.