As Da Prof said: Got a call from this unknown number. I don't pick up unknown numbers - I wait for a voice-mail to see if they are worth a return call. There was no voice-mail message left.
Got a call from this number. It's an automated message about lowering my credit card interest rate. "final notice", "Press 1 to transfer"... I hung up. Funny, not one of my creditors has the number they called on, it's my business line. Obvious spam call.