I got a call from this number and no message was left. The caller id said "unassigned". A reverse trace came up with only a city (Fullerton, California) with no address and no name or business. Three service providers came up associated to this number. 1.Verizon Business
2. MCI Metro ATS Inc-CA
3. MCI Worldcom Communications Inc.-CA
All this info screams scammer. No legitimate business would ever block and hide their name and location. And the FTC "No Call List" only pertains to legitimate businesses. Block and report to the proper authorities.