What happens next?

How to make a guy ask you for your phone number
Act playful.
Being playful is a form of begin flirtatious. Sometimes, a guy will be too afraid to ask for your phone number because he won't think you're into him.
It's up to you to let him know that you're interested and would love to see him again and to give him your number. To be playful, just tease him a bit, lightly pat him on the arm, and just show that you don't take yourself too seriously.