ooooook... back on topic maybe?
During robot programming training I will admit some of my students are on their phones. I have observed several to regularly be playing hearthstone on their mobile devices.
I have also observed students not on their phones randomly showing me "hey check what I did" with OpenCV and going
neat.
I will put reasonable effort into getting students excited to do the thing that I love most, however I am not the police. If students are going to spend our limited sessions on their phones, my time is better spent explaining how neural networks work to the actively engaged students than policing the actively distracted students.
Quite frankly I think this works well because when I do police people, they don't enjoy the thing they're doing anyways and get nothing out of it. IMO the work you do in FRC needs to not feel like work. It needs to be a fun game that happens to result in a fulfilling ($$$) career down the line. If the game on your phone is more fun than teaching a robot to
love see, I'm not a skilled enough teacher to change that, and quite frankly haven't had the pleasure of meeting someone who is. I would recommend looking into one of the many other facets of FRC that may capture your interest more thoroughly.