i don't wonder usually because i don't like to give my number see i know myself but i don't know the girl when you just meet her. therefore it is hard to know if she is interested or not see women are complicated, sometimes they may seems interested but they are not. so it is better that you keep your number to yourself and if she is interest in you then she will give you her number on the spot. believe me friend, women, if the really are interested they will give you all the green lights, aside that you can't just assume. you can't just believe, you have to understand the sign.