I made the mistake of registering a .us domain and using my regular phone number, after six months I've started receiving the infamous robo IRS calls. The robot call is listed as being from 1-866-978-6618 and in the voicemail requests that I call back that same number. Online this number is listed as being used for the IRS scam in June 2017. How does a scammer set up an 800 phone number without having it traced back to them? Why is this number still operational after a week of scam calls?