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How Do I Prepare My Phone for a Protest?
(themarkup.org)
This is a most excellent place for technology news and articles.
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.
Use cash.
I did say that. But yes. Use cash whenever possible.
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.