called 2 times.

I started seeing this number on caller ID and could not figure out who it was.  Finally, I was home when they called again.  It was the automated system from the library telling me that a book I had put a reserve on was being held for me.  Apparently, the library system from my city is hooked up to a national library database system.

Somebody called me from this # and hang up.

This is your Library calling you. You have a book on hold that has come in.