You are putting way too much energy into this challenge. This should tell you that getting phone numbers is just a small portion of the total game. Instead of worrying about what's the perfect message to leave or what's the perfect way to deal with the caller ID/cell phone messages, concentrate on creating very high interest even before you call.
No matter what, girls will always screen the first phone call. If there is enough interest in her part, she will call back, or make sure to pick up the next time. Don't worry about leaving a message; leave a message and don't make too much out of it. Believe me, by the time you call her, she's already judged you and knows how much interest she has in you.
Going out of your way to get phone cards already puts you in an "inferior mentality" category. You have to be deceptive and trick her into answering the phone she gave you the digits to? What you must do is STAND OUT from all the guys that ask her for her phone number, specially when you first get it.
If you are gonna see the particular hottie again, then don't even call her until you've seen her a few times. Don't mention the fact that you're gonna call her; let her ask/wonder why you haven't called. You got all kinds of action going on anyway, after all, so one girl's phone number is relly irrelevant at this point. You'll be surprised, a lot of times they're the ones who ask, "why haven't you called me?" or a similar type of question. At that point, when you call, she will remember you.
If you're not gonna see her again, you better make a very good impression and chances are a good percentage of those hotties will actually want to talk to you; I would make sure I got the e-mail also. Make sure you are the one pre-qualifiying her. Don't force it out of her or beg her for it. Ask her questions like:
"Is this a phone number you actually answer?" If she throws the "Why don't you give me your number" line at you, respond with something like "Oh, come on! Does that line still work with guys you talk to?" or "Don't play games and write down your number." Always be ready to walk away, you don't need to have her number. If she asks for you number instead, you can also tell her, "You know what? You don't need to give me your phone number." Reverse Psych. I've used that one myself several times, and they've turned and said "I guess I can give you my number." It is all a game. Learn how to play it and you will look forward to dealing with it.
Bottom line: since you probably won't see her again, it doesn't matter if you leave a message or not. Just leave your info and if you want, call her one more time a few days later. Next her if there is no response. Best bet is to make sure you have created enough interest. 5-9 day rule might not be such a good idea with the ones you haven't had a chance to build great rapport with, because it might just be enough time for them to forget about you. So make sure you either make an impression or call them within a few days.
