Just received this call on my cellphone. Didn't answer, no name. I don't answer the phone if I don't know who's calling. I have caller id on both landline and cellphone. Didn't leave a message.
Called but didn't leave a message. First clue it was probably a scam was that it showed as coming from "United States" and not a city name. Called back out of curiosity and got a "User Busy" signal.