Who called from 2127770001

This number calls.  I answer.  Nobody is there.  I hang up.  Vicous cycle!  I call the number.  Guess what?!  Not in service??  How can that be??  :o(

This is the secong call now in 2 days

Something tells me that this is some kind of scam.  There is never anybody there.

Have received to calls from this number.
Why do they do this kind of calling?
Do they not have things to do.

I figure the more I put here...the more other's will help me figure this out.