left a message saying only "hello" then hung up. blocked.

They did not leave a message but the caller ID had V22813100000067. What kind of caller ID is that? If you can't identify who they are, I say it's a scam.

Did not leave a message. Spam

same as above

An unwanted call from this Anaheim VOIP number arrived today.  When the answering machine picked up, the caller left no message, just dead space.  Robocallers (unlawful telemarketers) do this all the time while trolling the phone lines seeking gullible schmucks to victimize.

DO NOT BECOME A VICTIM OF THESE TELECRIMINALS.  LET YOUR ANSWERING MACHINE TAKE THEIR PATHETIC CALLS.