All this being said, I don’t see why it’s a problem if you use your smartphone wisely.
In my classes I’ll often use it to look something up for a professor or translate something in French class, and if something important is happening in my life, I’ll have it out so I can reply to texts when necessary. I don’t think this kind of usage is inappropriate at all and I think I should have perfectly liberty to do so without feeling bad about it.
So, I guess what I’m saying is that I wouldn’t like to trade this kind of freedom for free food.