Seems simple, but people are addicted to their phones these days. If you say no phones while sitting at the table you may have mooks getting up and walking a foot or two away from the table. I don't like the idea of players having to police what other players are doing on their phones during the game, weird situation. Looking forward to seeing this develop, I think its been building as a problem.
Personally I love the idea of no phones for the casual aspects. I think many casual/bucket-list players that head to the WSOP are the ones excited to play and looking around and socialize at the table while many grinders/misregs are the ones scrolling Twitter with headphones on lol. Obviously I'm biased because I play baby stakes but I make sure to keep tourists happy and talk to them whenever you see a new player. At best you pick up a tell or they softplay you, at worst you waste some breath, oh well.