Caller ID displayed as "Name Unavailable" following by an unrecognizable number. I let it go to my answering machine to screen the call. The answering machine recorded what seems to be wind noises, then a human cough and a sneeze. The entity then hung up. I dialed back the number and encountered an automated message that said "The subscriber you have dialed is not in service. If you feel you received this message in error, please hang up and try your call again later." The call then disconnected.
I did a reverse phone number search via whitepages.com and the website states "We did not find a match. The subscriber number for the given number is invalid."