Or own a "burner" type of phone with minimal data about yourself.
Alternatively what RMS does is he shuts off his phone and only turns it on when he needs to use it.
Alternatively what RMS does is he shuts off his phone and only turns it on when he needs to use it.
Or at least I know that in one court case there was a nice big 8x10 of the defendant purchasing a burner phone. Apparently a lot of Point of Sale systems, especially where they sell burner phones, are wired to take a nice portrait of you when you purchase. I didn't know that at the time, and apparently, neither did the defendant.
That, combined with the location of his phone matching the location of his license plate around town did him in.
So if you try the burner phone thing, someone else has to buy it, and you should never take it with you to places where there are likely to be security cameras. And you also might want to refrain from driving with it in your vehicle.
However, if state persecution isn't part of your threat model, a burner is one layer of indirection that might make tracking and identification difficult for surveillance companies.
I mentioned radio, because wifi / cell tower triangulation can be used to infer location.
He also only browses the internet by emailing himself text/HTML from a remote server.