Caller ID displayed as "4243792078", following by an unrecognizable number. I let it go to my answering machine to screen the call. They didn't leave a message. I dialed back the number and encountered a recording that said, "Thank you for calling back. We attempted to reach you to participate in a marketing research survey or on behalf of a political organization. We apologize for any inconvenience. To be removed from future calling, please press 9." I then hung up.