I get calls from this number every f*&^ing day lately.  Never anyone on the other end.  SO ANNOYING!

I'm getting 10 or so calls from this 213-000-0000 number a day they leave blank messages if I dont pick it up but there is no one on the other end

i'm getting calls from this number on both my home and cell phone and there is never anyone there.  it's all dead air.  if i don't pick up, there is never a message.  it's pretty scary to get the call on my home number, immediately following by a call to my cell.

Got this call late in the afternoon and there was no one on the other end. My guess is that it is some sort of auto-dialing marketing service that checks whether/when someone answers your line so that they can steer telemarketing calls to you around the same time of day you answered.

Receive call a few times a day fro 213-000-0000. Any ideas?