How to Protest Without Sacrificing Your Digital Privacy

If you're a peaceful protester, but you don't necessarily want your participation in a demonstration to follow you around or lead to harassment online, what sort of steps can you take around your digital security?
Bring a clean phone: “They'll be, obviously, cell-site simulators,” said Matthew Mitchell, a founder of Crypto Harlem. These devices, otherwise known as IMSI-catchers or Stingrays, can record phones' geolocation, their phone number, and sometimes the content of texts and phone calls. "If everyone is texting a couple of organizers, or calling a bunch of friends, that one friend that connected to all people could be identified,” Mitchell said.
Or bring no phone at all: The simpler, and probably more effective approach for protecting privacy, is to not bring a cell phone at all and rely on more traditional methods of activist coordination.