Shared here for public benefit.
Before going to a protest, demonstrators or observers should note that their cellphones may subject them to surveillance tactics by law enforcement. If your cellphone is on and unsecured, your location can be tracked and your unencrypted communications, such as SMS, may be intercepted. Additionally, police may retrieve your messages and the content of your phone if they take custody of your phone, or later by warrant or subpoena.
Buy a feature phone in cash at a Dollar General as far away from home as you can feasibly get. Do not interact with any other business in the area. Just buy the phone and leave. Activate it at a public library. Add no contacts. Tell no one that it exists.
You should probably leave your own phone at home when you do. You don’t want the burner phone and your own showing up on the same towers at the same time. Turn the burner completely off when near home or your personal phone.
That’s good advice as well, but really only important if you’re a long-term PoI. If you’re just arrested for rioting/protesting, it’s probably not essential.
Use cash.
I did say that. But yes. Use cash whenever possible.
Sometimes my eyes go faster than my brain. Skipped that word completely.