CallerID = Unknown Name. Left no message at 1pm on 4/14/17. Undoubtedly related to a great number of spam calls that I have gotten in the past few days from following numbers. 510510-470-6438, 510-256-6077, 6579991748, 9186220448 all with CallerID = Unknown Name.
Finally picked up one frm 9186220448. Noise of a large call center was very loud, lots of white noise. After I said hello a man's voice came on but was muffled by the background noise. I think he said good evening (it is mid afternoon here) and I responded Do Not Call Me and hung up. This is obviously a cheap/ignorant scam center.