How would ask your crush for their phone number without obviously showing them that you like them?

ok, me and this guy are friends and I had this crush on him for a while, I do know he flirts with me but I don't know if he would actually go out with me. we olnly see each other once a day and that's at school, but I still want to talk to him after that so how can I ask him for his phone number without implying I like him or how could I drop some hints that I want it?

we are aslo friends on Facebook but I raely see him online and I when I want to chat I also get so nervous and don't know waht to say please help!
How would ask your crush for their phone number without obviously showing them that you like them?
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