I would take the phone in... At first when you were talking about call quality, I was going to suggest changing your voice privacy settings, but with the music player doing that...
If you haven't been doing anything with sound applications, you might want to try backing your stuff up and doing a reset yourself before taking it in.
Jm2: I think your teenager is going to have to bug you to get your bill so that she can see who she's been calling to get the phone numbers that way (of course it won't help in figuring out to whom those numbers belong.) There really isn't a good way if you didn't back them up.
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