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.
Non digital is sufficient. And if it must be digital for some reason, no you don’t specifically need to use a serf phone for that.
I get around just fine without proprietary tracking BS. Navit + Openstreetmaps pre-downloaded binary data + detachable USB GPS transceiver.
Softphones and SIP telephony are fine for this.
Sauce: I am a functioning adult who lives without a phone as a matter of principle.