From the article:
When we went to our seats, the wait staff let us know that despite the fact that the previews were playing, we wouldn’t know until the movie actually started whether we could see the film or not. If it didn’t work, the screen would just turn black. Luckily, the film went through without a hitch.
Ah yes, let’s put all our bets on cellphone infrastructure. Because that never goes wrong.
You do know landlines are still a thing, right?
Landlines are not part of the emergency broadcasting system. TV and radio are.