huh, that's pretty cool. this type of thing doesn't often cross a girl's mind, I think, so it's kind of hard to get the girl to believe it, especially after she says she has a boyfriend.
i mean, if you say to a girl "can I have your number, we can chill sometime, you know as friends or whatever 'cause you're pretty cool", she'll think it's a line to get her number and it's not a friend thing. (whether she's interested or not)
if you ask her her number and she says "i have a boyfriend", and THEN you say "oh, nothing like that. I meant just as a friend thing, just to chill or whatever", ( <--- I guess that could be an answer to the title question), she'll think you're trying to cover up awkwardness.
i've never thought about it, but yeah, clearly it's not always to hit on the girl. but I think for most girls at least, it's such a foreign concept that a guy would get a girl's number just to hang out as friends sometime, that they just wouldn't believe it.
it's one thing if you've known each other for a while and are more or less just friends; or if you meet at school and have class and have some assignment to work on together.
but if you just meet, think that person's cool, want to hang out as friends, then the whole opposite genders thing has to come into play.
haha I don't know why I'm even answering this question, ohmylovely has covered all the bases pretty well and clearly she deserves best answer!