How do I get her number?

So I'm going to get her number, but how do I do it? I can't ask her for it because I ha e no way of getting to her. If we plan a date to hang out over text or call I need her number (obviously).

I could ask Some one for it, but who? I don't know any of her friends. (We don't even go to the same school)
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How do I get her number?
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