As a "millennial" I can assure you, MOST schools do not allow cell phone usage in class. I've had my phone taken away multiple times when I was in school because my alarm went off or because it was seen in my lap. Sometimes, you'll have the occasional "cool" teacher or sub that's not concerned by them, but usually only in down time.
I didn't watch that video, but I'm assuming he's either one of those teachers, or a sub.
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"Do. Or do not. There is no try." -Yoda
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