As to giving my number, I do it here and there.
As to getting women, I rarely approach women. It just gives them so much power from the offset.
I'd rather talk to a girl from a place of strength than a place of lack.
I put myself in the right place and the girls show interest by either entering my orbit, sliding me their phone numbers or they open me.
Though rapid approaching or going out to malls to approach women was never my thing.
It is so much easier this way. A girl who does either of the above has a higher chance to show up on a date and is an almost guaranteed lay.
I wrote about one of them
here.