How do I indirectly make a person I want to have conversations with, put down their cwlphone and just start talking to me?

Cuz i'm going back to college in August and i know alot of people this generation always take out their celphones and staet looking at it and typing stuff, but I want to make a few friends and if there's a girl I like even if she already has a boyfriend I still would like to have some sort of relationship and starting w conversations how do I get them to put down their celphones without tellin them to do so, and consitently spend more time talking w me than them always looking at their iphone or samsung.

Which generation are you from? I'm a baby boomer, and generally won't trouble someone who's on their phone, unless I have a specific question, like is there a Chase ATM near here. In that case, I'll just say "excuse me" and ask my question. With someone my own age, I might make small talk. But my situation is a little different - I'm happily married, so I think girls can sense that I'm not trying to hit on them. Besides, the age difference.