In the past two days alone, I've gotten over 20 spam calls with none of them leaving a message. Just 3/4 seconds of silence on my voice mail. One call the other day left a 22 second blank message.
No, but I'm curious, do you order online a lot, where you have to provide a number they can put on the package? I assume someone along the way makes money on the side by collecting/sharing these numbers. But maybe that's just my paranoia.