No one answer when you call back. The ring tone sounds "faked" -- as if the number answered after it captured the caller ID and suppressed the real ring back. And then, not recognizing the ID, it makes a computer generate the ring back, which goes on forever.
Received a call from 1-239-628-3780. Caller ID was just the phone number. A quick pick up and hang up is all I give these scammers. After checking 800 Notes, I block the number if needed. In this case, I blocked the number as the above post showed a different caller id. Who does that??? Scammers!