So uh pretty basic question. I can get girls to ask me for my number just fine - and I can ask for theirs (and get it) just fine; I know getting them to ask for mine is the preffered but how can I mix the power of having their number and choosing when to text them with the benifits of having her ask me for mine? Kind of a high end question but any advice is good - edit- i just realized im asking for some techniques on how to get a girl to give me her number without me overtly asking

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To game at your best you have to be willing to do your worst.

I'll build comfort until I'm sure she'd give it. Then I'll make up a reason why she should give it (preferably a future date) and I'll ask her number. So that's one shot, one kill.
I'll never ask for a number when I'm not 100% sure there's enough interest. I'm way to busy to start texting girls who aren't that interested anyway.

Also: I've once forced a number. She was like "I don't give out numbers at bars." The classic. I was like "Seriously? There's no line more lame than that one." She said "How about facebook?" I said that's bullshit and I never take a girls fb. She then gave her number. Led me nowhere.

The answer depends on how many numbers you are getting, and how often you can be bothered playing the odds and chasing up these girls. Me personally, I like to build enough attraction, let them have my number, and leave it in their hands. If you frame it right a lot will call or text, saves wasting your time on girls who dont answer.