Ask him for it.
How to get a boy's number?
Ask for it
Ask. Use words :D
Become friends with him first. Then ask him for it
Yeah, be friends with him and try not being shy and ask him if you can have his number.
Just like everyone here said, just ask him for it but you should probably try befriending him first. However if you are kinda scared to ask him straight up, I use this little trick and I say "oh hey do you have my number?" I know that they don't so then they say no and then I give them my number and it's only reasonable for them to then give me their number in return.
Why not try giving him your number if your want to be friends with him. If he doesn't call you know he's not interested then move on.
I was gonna say ask for it because it's the right answer but everyone's saying that so I have a alternate plan !! Tell him your not sure if your ringers working .. Ask him call your number ... It rings .. Say oh guess it's working ... Now you have his number in your phone .. Add to contacts ... Sneaky !! Bam !