Asking for a girls number?

whenever I ask for a girl's number that I have a crush on or I'm flirting with, I always get some hesitation, then an okay. then when I call them, they don't pick up, LOL. so, whenever I ask to exchange numbers or to get their number, I'm waiting for that "UHHHHMMMM" always.

ladies, when there is a guy you like, how do you react when giving/exchanging info? do you just jump up without any awkward hesitation and give it to him, or are a little surprised and you hesitate a bit because you are shy? reason I'm asking is because next time I hear a "UMMMMMMMMM", I'm going to smile and said "never mind." lolol.
Asking for a girls number?
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