Anither caller in my cell with no meaningful caller id and no message left. Number is in line with other scam numbers blocked recently (same first 5 digits) so onto the scammers pile this one goes.

I picked up the call and nobody responded when I repeatedly said: "Hello."

It's the free cruise survey scam.  Call back gets, "Thanks for calling.  The survey you were called for is now finished."    There is no survey just some nonsense questions.  You'll be offered a free something for completing the survey then asked for your credit card number.  It's a SCAM.  Block it. Here's a news report on it:
https://www.youtube.com/watch?v=I4tY1kz6lZ8
http://scam-detector.com/travel-scams/free-cruise
http://protectingyourpocket.blog.palmbeachpos ... n-package-scam/
http://www.floridatrend.com/article/20232/flo ... -vacation-scams

MIssed call. No voicemail.