Received 5 calls from this number today.  Finally picked up, because an initial search of the number didn't turn up anything suspicious.  When I picked up, an operator told me that I'd been entered into the "Dream Come True Sweepstakes" for Visa, MC, and Discovercard holders.  Asked if I had one of these cards.  I said yes.  He then said that he needed to give me a survey (don't remember what reason he gave) and proceeded to ask if I am single, married, widowed, divorced.  I said that I appreciated being entered into the sweepstakes but that I was busy and couldn't talk.  He said he would have someone call me back later, told me to have a nice day, then hung up.  I have looked up the "Dream Come True Sweepstakes" and it appears to be a scam to sell magazines - others reporting different numbers have posted that the questions in the survey are intended to help them choose magazines you might be interested in.  I registered with the Do Not Call registry (thought I already was).  If they call back, I will just ask to be removed.  I might change my CC number, since they obviously have some of the information related to it.