This number has called me 7 times just today. I have no idea what they want or who they actually are, but the ID says "SSI". I'm on Social Security, so I answered the first time they called and they hung up. When I called the number, it said that it was no longer in service. I waited to see if they'd leave a message when they called back, and they haven't. My guess is it's a scammer, so if you receive Social Security, don't fall for the spoofing. Don't answer the phone when they call!