You guys out there are lame sometimes. Getting her number is a skill set all it's own. Most throwaway phone numbers are a result of the man getting the number too fast.
First of all, if you’re at a bar and meet a girl, don’t talk to her for only five minutes and then start getting her number and leave thinking you’re going to score. After all, what’s the point of getting a phone number in the first place. It's to meet up later and continue the seduction, right?
You had her right there at the bar, right then. You could have used that opportunity to build value with her right then. You were on a “date” with her right THEN but you didn't recognize it. So getting her number so that you can meet up with her later, and walking away from the interaction in the moment is totally counterproductive and nonsensical.
Also, if you start getting her number without going through the proper preliminary steps, then yes, the girl might be digging you, but in reality you didn’t have enough social value to her for her to want to start an ongoing, dating relationship with you.
A girl who with a social value of 8 might give her number to you if she perceives you to have a social value of 6 but that doesn’t mean she’ll follow up with you. Getting her numbers is only solid when you both have the same social value. What is this social value I'm talking about? Well, it's basically a persons standard in their relationship, dating, sex, love and self confidence. Where you stand with him or her and your compatibility can pretty much be discovered if you know what to look for. It will be a waste of time if you both are not suited for each other. Break ups can be hurtful. So unless you're just looking for hot sex without strings then aim low.
Guys, building a peak social value of 10 is not easy so work hard to get there. It's not you who should be worried if you're at that peak yet but it's how she sees you that counts. Will she be interested when you meet her or when you ask for her number. As time goes on and you start to develop better interaction skills and seduction methods so just beware of one thing. Don't blow it by thinking that you can get any girl and become a arrogant jack ass. Women will drop you like a stone if they see that sort of behaviour and if word starts getting around that you're like that you will have a hard time repairing the damage.
Developing those skills and nurturing your social value is a personal responsibility. Also, in the company of other guys you will be the dominant, stand out guy there if the rest are lacking. This gives you better chances with the ladies. Women will see it very clearly even if you don't. You'll be amazed that you can get more than a phone number.
Bar advice. When you just meet a girl, stick to a game plan. The last thing on your mind should be sex just because she gave you her phone number.