Who called from 6504873311

Caller apparently phoned at 8:21 p.m. tonight (Thursday) and (s)he left no message.  Caller ID just says "San Francisco Peninsula Area."  I have blocked the caller.

My phone number is on the federal Do Not Call, yet I still receive junk calls from (presumed) spammers such as this one.

Same. If you call back, you get an answering service. Seems to be a fraudulent operation

Received calls from this number 9 times in the past week or so. I picked up one of them and nobody was there. I have blocked this caller. Caller ID said REDWOOD CITY CA.

That same number called me 7 times in one day.  I finally answered and no one on other end. Annoying and blocked!