No ID, unknown number.  I never answer such calls.  No message.  Likely a SCAMMER; I've gotten 3 calls today, one from each of the 3 Phoenix area codes, 623, 602, and now 480 - all the same:  No ID, unknown, no message.  Friends and other legit contacts know to leave a message.  Block if you can.

Political survey - didn't ask if I wanted to participate just started asking questions = robo call.

Just called again.  Another site says it appears to be an invalid number.

3rd time is not a charm, SCAMMER.  My guess is that whoever is behind these calls is simply phishing for valid numbers -  even a valid political survey outfit would identify themselves.  Caller ID is a good thing - wait until the number pops up, if you don't know it, don't answer.  If everyone did that these calls would stop.

Calls many times a day.  No name - Out of area.  No message.