Yesterday, I posted a reply that said, just do not bring any cellphone with you. I do not own one & double check people using electronics around me during activists activities. Lat night, before I went to sleep, the obvious occurred to me, activists need to record evidence of what is going at the activism.
Thus, my updated answer/recommenation (as a veteran, own no cellphone & double checks people using electronics around me activist) go back to the ‘80s’ or maybe, even ‘90s’ recording technology to record evidence of what is going at the activism.