I got calls, didn't answer, I think for those who pick up and get silence, iI've heard t is some way of confirming that it is a good number so they they either keep bugging you and/or sell your number to other places.
I think they are getting #'s offline. Scammers. BEWARE!!
I have filled out free boot contest forms(@ cavenders and Tim's boots) and that's the only thing latly. Just got a call from this #. Did not leave voice mail or anything.