[avenius]

Last year I went to a King Crimson concert. There were no "phone prisons", but they repeatedly informed the audience to keep their phones pocketed until the end of the show. This seemed to work wonders, as I didn't see a single phone for the duration of the show. Now, naturally this was a somewhat different audience than e.g. a Chris Rock show, but it does prove that it's possible. Maybe it all comes down to respect?