if a guy wants my number, he better call me...
i give him a week though, since most boys don't call the first day anyway. i think i'd think it desperate if he did.
and if i'm busy the nigth he asks for (usually will be, sorority stuff is so time consuming, but ilove it
) then i will offer a day when i'm not busy.. then if he is, i'll get bored and tell him to call back later