The right to assemble and protest is enshrined in American law, but it can still be dangerous to hit the streets to make your voice heard. Your devices are a treasure trove of information about you, and you may not always know who’s collecting that data. Take a few minutes before you go to assess your digital and physical safety. Even if you have nothing to hide, you don’t want to accidentally give law enforcement officials any information you didn’t intend to share. Follow these tips to lock down your phone before a protest or other peaceful assembly.
That and cell towers….
But a cheap burner. Don’t activate it. Keep it in a faraday pouch. In an emergency remove from faraday pouch and call 911. You can do that on phones you don’t activate.
But everything else, like you said, document with a digital camera.