As someone who miraculously doesn’t feel this urge to constantly “check” his phone, I have to ask: what are you people “checking” for, exactly? It’s still there—it hasn’t gone anywhere. Is it the notifications? Why not just turn them off? I can assure you that there’s nothing on your phone that can’t wait an hour or so until the movie is done.
Out of 10,000 people “checking” their phones, probably around 1 of them is actually waiting for something urgent and important. The rest are doing it out of pure addiction.
Everything wants to hijack your attention via your phone now, whether it's apps spamming notifications or companies spamming SMS. And arguably every once in a while there is something you would like to know quickly, but any channel that comes on just gets abused by cruft.
If it's addiction, it's addiction through exploitation.
I think checking your phone unless you are actually expecting an important notification is a symptom of the problem we are discussing here.