There might be situations where giving a girl ur number might not be such a bad idea.
Imagine you meet a girl randomly who you have never met before and the chances of you too meeting again are low. Assume there had been some flirting whether verbal or non-verbal. But the conversation can't go further for some reason other than because you can't summon up the courage to do so. In this situation for example you have nothing to lose by giving a girl your number.
But at the end of the day this is only likely to work if the girl is interested in you already.
Imagine you meet a girl randomly who you have never met before and the chances of you too meeting again are low. Assume there had been some flirting whether verbal or non-verbal. But the conversation can't go further for some reason other than because you can't summon up the courage to do so. In this situation for example you have nothing to lose by giving a girl your number.
But at the end of the day this is only likely to work if the girl is interested in you already.