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.
You get a burner for the protest and give your phone to a friend or family member for the day so that it still pings towers at the usual places.
Or at home. It’s not unusual for me to spend several hours at home on a Saturday.