Who called from 7047783368

i want to know how these people get hold of your unlisted number?

It is probably robodialed by a computer that calls in order.  If your number ended  in -4567, -4566 was called just before you and -4568 was called after you,

Called my cell, left no vm. I don't answer numbers I don't recognize unless I'm expecting one.

Called me 2/12/16. Didn't answer..no msg was left.

Called, didn't leave a vm.