I want to slap a boy
Why would you slap the boy?
Because he took my phone and put it out of reach
I understand it was wrong of him to do that. But he was only trying to have fun and he's only a boy. Instead you should speak with him or his parent.
Nah, I want to slap him.
There is never an excuse for violence. If you want to get back at him, then tell an adult.