This number is actually registered to pacific telecommunications in California, not Nielson Ratings service. They are actually debt collectors, they try to get you to "confirm" your name and address with them. I thought something felt suspicious about the call, and when i gave them my name they said, you're not (name withheld) ... a couple who apparent had a lot of debt issues and used to have our phone number. Once I confirmed I wasn't, they said, OK, we'll send you a ratings book, and quickly got off the line. After a couple weeks, no ratings book, no further contact. I traced the number back to pacific telecommunications and they are a business that charges others to use their phone numbers to "spoof" caller ID; see the following from Wikipedia: "In June 2012 a search on Google returned nearly 50,000 consumer complaints by individuals receiving multiple continuing spoofed VOIP calls on lines leased / originating from “Pacific Telecom Communications Group” located in Los Angeles, CA (in a mailbox store) in apparent violation of the FCC. Companies such as these lease out thousands of phone numbers to anonymous voice mail providers who in combination with dubious companies like “Phone Broadcast Club” (who do the actual spoofing) allow phone spam to become a greater and greater problem, if not huge at this point."