I have such a tough time getting girls to call me back too...
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We keep seeing this same complaint coming up. Perhaps it's worth a post by itself.
I can say I've met more women than I can count who did not return calls and would not initiate calls, either. Every effort I made to get them to return a call got nowhere (no exceptions!) Low interest? Oh yeah. And if it started with high interest it soon became low because my trying to get them to call was WEAK, showed insecurity or desperation and turned them off. It sends a message that you're a boy, and you're either scary or pathetic and--as summed up in their mind--beneath their level (read: loser!)
I've had high-interest girls call me though, and the trouble comes from them wanting a long, 2-hour, in-depth conversation. I used to hang on and talk, now I know better.
Check this out--the ones to call me like that all had high interest levels, but when I think back on it, they were the ones I later found were either young (immature) insecure or somewhat desperate--never one of the quality chicks.
I don't even bother leaving a message now, even if a roommate asks (they have caller ID, they know who called.) At most I'll say casually "tell her TR called, I'll try to catch up with her later.." or some other blow-off line.
Use NineBreaker's guide
So if she doesn't call you, it could be for low interest level, or not high enough for whatever reason (shyness, nervousness, 2nd thoughts, BF in picture, your request to call back is WEAK and now she sees you differently...)
It's possible her not calling means you've stepped up to a higher caliber girl and you're being tested--she's going to play her role and expects you to play yours (a DJ). She possibly has high interest.
Just ASSUME they won't call because it's NOT their role. Now, if you're not getting calls later in the dating cycle, that's another issue.
Some posters whine about how unfair it is (I'm not saying you were T-F.) If you resent it, remember that it's YOUR job, not hers. She did her part making herself available to be asked out and giving her digits when you asked, now it's back to you. I'd say if you're whining about the "unfairness" of how they don't call, don't bother pursuing anyone until you get over being a hurt little boy, accept it and start performing.