Asking for the # of a girl that I already know fairly well?

as we've already talked numerous times , asking shouldn't really be an issue right? she's never like offered which kind of surprised me , feel like its left to me to ask.

guess never asked as i don't even use phone much and we always talk in person and so easy to do that it wasn't really necessary but maybe i want a bit more from her so it help us build a stronger connection if we another means to communicate

i don't think the odds of rejection are that high if at all as we talk so much it seem odd she'd have any issue with me having her #

i'm just not entirely sure how to ask and would she wonder why i suddenly wanted now? after never asking
Asking for the # of a girl that I already know fairly well?
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