An anonymous reader writes: The Electronic Frontier Foundation has updated its guide for protecting yourself and your cell phone at a protest. In addition to being extremely powerful tools (real-time communication to many watchers via social media, and video recording functionality), cell phones can also give authorities a lot of information about you if they confiscate it. The EFF is trying to encourage cell phone use and prepare people to use them. (The guide is based on U.S. laws, but much of the advice makes sense for other places as well.) Here are a few small snippets: "Start using encrypted communications channels. Text messages, as a rule, can be read and stored by your phone company or by surveillance equipment in the area. ... If the police ask to see your phone, tell them you do not consent to the search of your device. Again, since the Supreme Court's decision in Riley, there is little question that officers need a warrant to access the contents of your phone incident to arrest, though they may be able to seize the phone and get a warrant later. ... If your phone or electronic device was seized, and is not promptly returned when you are released, you can file a motion with the court to have your property returned."