1-561-672-0547 called today, and left no voice message.
I called it back and a recorded message said its voice mail-box was full.
This number was added to my "Black List" of the "Call block" Android software (orange shield icon).
"Call block" really works: they call once, and then never again.
N.B.
"Call block" is a free full-featured Android App to block harassing phone calls and SMS for you.
https://play.google.com/store/apps/details?id=cn.menue.callblocker
Adios!

Called and asked about a prior subscription on 9/10/13.  Told them I'm not interested.  Filed a complaint on www.donotcall.gov.

Caller claimed to offer renewal for a magazine that I subscribe to.  I knew that the subscription was about to expire, so I thought it was a valid call.  They even gave me a toll free number to call if I had questions, and said they would send me a confirmation email.  I never got the email, and when I called the toll free number, I got a voice recording.  I left a message, but they never called back.  I called the magazine, and they said the call and renewal was not valid.