Guys, when do guys ask for girls number?

I've just been wondering since I have friends who are constantly getting approached by guys and getting asked for their insta / numbers but then again on the other side I have absolutely beautiful friends who have never been asked in real life. I wonder why that is? So I get that sometimes it's more scary to approach someone who u consider to be "out of your league" but that's not always the case ofc. So what exactly makes guys take that first step or what doesn't?

Guys, when do guys ask for girls number?
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