Hung up when the answering machine came on.

They called my cell phone...said "unknown number" and didn't recognize the number, left blank message.

Annoying!

Msg identified as coming from phone number 937-203-0967. 5 seconds of silence. How do I get these to stop?

Someone from that number called me and said nothing.  I hung up!  I don't have time for games.

I have now started to pick up the phone and leave it on my desk, then just go about doing what I was doing. There seems to be no way to stop these annoying calls. When I call back and try to get on do not call list, that doesn't seem to help. Or, I will pick up, and immediately hang up.  Again, doesn't stop the calls, but gives me a bit of satisfaction to hang up on them.