It means he is communicating with somebody.
He wants you to hold his phone. Obviously.
It probably really doesn't mean anything.
He likes you.
He wants to plow you
His wife is nearby
it means he wants to *** you
Answer Could be, why don't you do something in return for this guy and see where that takes you.
Probably.
Roar, I'm a dinosaur.
It could mean that the guy was just being playful and teasing you, but stopped when the teacher intervened to respect authority. It's a sign that he knows when to draw the line between fun and respecting rules.
Just because he talks to you on the phone doesn't mean he likes you. I mean he might like you as a friend but not like a girlfriend.