I can't find it now, but I read an article about the Capitol riot that said the FBI was actively looking for individuals whose phones followed the pattern you d

I can't find it now, but I read an article about the Capitol riot that said the FBI was actively looking for individuals whose phones followed the pattern you describe. Traveling towards the Capitol on Jan 6, going dark, later coming back online is perhaps an indicator the person didn't want to be observed at the Capitol. Likewise, traveling to D.C., and leaving the phone at the hotel all day, then moving in the evening was an indicator the person may have been at the Capitol. I bring this up to say, Faraday cage and leaving the phone behind may not even be enough with a sufficiently large surveillance state. Edit: leaving the phone at home is different than a hotel, of course. But even that might raise too much suspicion unless you frequently, and randomly, leave it at home. That way the lack of movement wouldn't necessarily indicate you didn't want to be tracked at a particular moment.