getting the number is the first step in a process of steps that needs to be taken.
ideally, you would like to cook her interest before you close the number. you do that by connecting, sense of humor, listening, ****y/funny, busting her balls and then some. of course every girl is different, so you want to be case specific and alter what youre doing according to what youre working with. a sensitive girl with her guard up will require more of your time to allow her to trust you. some girls may require more of the classic male role, etc.
if you havent cooked her before you close for the number, u have to cook over the phone. a lot of DJ's say that the phone is only for setting dates, but i disagree. its also a great way for her to realize how cool you are, and to able to trust you. its also a great way for you to know how this girl works. without those, you have nothing.
yeah, number closing in itself is meaningless, but there are other factors and voids that need to be filled before you can get her on the date and bang.
ideally you'd like to cook her interest before you close. then call her atleast 4 days later at nitetime, and cook her interest on the phone for a good 30 minutes (trust me, this works), and from there set up a date, because you have to "head back to your duties."
If she follows your lead all the way through, and she most likely will if you cook her well and there was some slight interest on her part from the getgo, then the date will go smooth as can be, and you basically can do with her as you please. now, this is considering she is as cool as you are. otherwise, you shouldnt be going out with her, if you find out shes some weirdo on the phone.
-david