I, unlike *MANY* of my friends, HATE to talk on the phone, this figures in as one of the reasons why I never give my number to guys....
I also do not like the feeling of a guy having my number and them being able to call me whenever, so in most cases, I never give guys my number, I get their's, and if I don't forget (I usually do though

) I call them. How it usually works with me though is if I run in to you enough (like if you're in a fraternity that we're paired with for something or I have lots of friends in a certain house or we have a common friend, or something like that) then I'll make plans to meet up and hang out later and go from there, but not give him my number. If I like the guy, I like to have the control in the whole "calling" thing, and plus guys to me always seem to turn out psycho and scary right away, and I don't like the idea of them being able to get ahold of me whenever they want. Call me paranoid maybe, but I just don't like it.