I have no issue going up to a girl and asking for a number. I mean my technique sucks, but it works for me. All I do is pass them and say, "excuse me, can I just say you are crazy beautiful", I wait for a response and say, "are you by chance single" then it goes from there. Is there a better quick way to ask for a number? Additionally, what should I do or say if a girl has a boyfriend, in order to get her number?