When you approach a girl at a bar or when you're out somewhere, you should always remain confident that you're going to get her number. If you're lucky enough to keep the conversation going for a little, by a certain point, start to end it by saying you need to get back to your friends. Nonchalantly, ask if you could have her number and say that you'd like to hang out with her sometime. If she says yes, give her your phone and ask her to program her number in. As she's doing it, tell her you'll call her after she's done so that she has your number, essentially ensuring that no fake number is given.

Something that is always good to do at the end of night is to text the girl that it was good meeting her and that you'll be in touch soon. You could add in a little joke or something that you talked about with her back at the bar. It's always good to get yourself in her mind, especially at the end of the night, so that she wakes up the next morning and remembers you.

Finally, wait at least the customary two days and then give her a call. Some people prefer texting but usually women like it when you call to set up plans. Drinks or something a little creative but casual is always a good plan for a first meet up. Keep the call short and sweet so that you leave plenty to talk about on your first official date.