Do girls give their number out if they are not interested?

I've received a few numbers over the last couple months from women who I've struck up conversation with. However, when I call a couple days later, they either A) Don't answer the phone and then don't respond to a voice mail, or B) Answer, but seem disinterested.

So to narrow down what the issue is -- Is it safe to say that girls will only give their number out if they are genuinely interested? If so, then I must be doing something else wrong.
Updates
+1 y
Appreciate all the responses. It's a little disconcerting to know that, but I'll keep it in mind for future encounters.


Again, thanks to all the quick responses
Do girls give their number out if they are not interested?
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