Reverse look up told me that the caller ID was, "u. s. Govt.. First of all the United States government itself does not call anyone, however a department of the United States government may but in a case like that caller ID would specify what department that would be. Then upon calling back it stated
that it was a non working number. My guess, telemarketer or some kids playing with spoofing. I've had this very same call before. Believe me if someone in the United States government wants you they have a procedure they follow and it always starts out with a letter sending campaign.