Three times I have received calls from this number - 2 were hang-ups, the 3rd to try to sign me up for college courses. The people who are selling this service have very thick accents and difficult to understand. They acknowledge that this number can not be called or traced, and refuse to provide an 800 number for a career advisor.
This is a scam so please proceed with caution.
I am a new verizon customer and the "block call" option is no longer available. It sure would make my life better if they re-instated this service.