To get your friends phone number, have something that he wants; this can be soccer jerseys or application. Give him details about it so that he may ask for your phone number and ask you for it. You can also request him as a friend on social networks sites as some people put their numbers on the webpage. Visit http://www.ehow.com/how_4510765_get-guys-phone-number.html for more tips.
What I do on this situation is I just say like hey what's your number if I feel like we were close enough friends. And if y'all just met I take his phone and put my own number in there and show him and say text me anytime. And if he likes you he will.