Do not press any number if you are prompted to do so. This will put you on the "chump" list, and you probably will receive more spam phone calls than you ever imagined you could.
Received first hangup/no message call this morning. As the number was ringing, Mr. Number identified the call as "Suspected Spam." I've blacklisted this number to return the favor--hang up with no voice mail option. Recently, I've received several calls from 504-358-0387, which reportedly is calling about free Bahamas vacation scam. I suspect this is more of the same from this new number.