“Don’t bring your phone to a protest. Leave it home. Not in the car. Leave it home”
If you absolutely must have a phone... buy a “throw away phone”; and, use cash in all transactions.
People lived without smart phones for 1000 of years, you can live without a phone for a few hours.
What phone call would you have to make that was worth geo-locating you to the proximity of a protest?
Thinking you can outsmart government technology will be your downfall.
Don't bring any phone.