Expected a call from the bay area, so I picked-up -- silence as if connection not complete; I dared not give my voice to this likely robo, called the number back, immediately got a non self-identifying voice mail prompt which I again,  dared not give my voice.

Got a call from the number.  Didn't answer, no message left, then looked up the number online and decided to block it

so tired of this

Got a call from 408 479 4931. I did not answer andwno message was left. Called twice in one day, one after the other. I called the number back and received an announcement the subscriber was not avialable and leave a message (I did not).

I blocked the number

Lady says from "Simply Solar".  I told her we're on "Do not Call" list and she hung up.  Really annoying