Spoofed and Spam dominate my service.

Yes, turn on do not disturb.  You can add your immediate family or all contacts as exceptions.  

There are daily news articles on what is being done to try to identify and stop spoofed calls, robo calls and spam/telemarking.  

There are several threads on the subject of spoofing or robo calling.  

Spoofing itself is legal, how it’s used for robo calls is not.  

School systems, towns, businesses all use computers to spoof their main business/system number to contact people.  https://www.fcc.gov/consumers/guides/spoofing-and-caller-id

More personal spoofing uses are smart watches and tablets.  Skype, viber are not real numbers either.

   Most spoofing by computer use robo calls, which does not know your number, they just call a block of similar numbers.   

   The law changed in October 2017.  Up till then carriers could not block calls, only the end user could.  

With the go ahead, AT&T, FCC and other carriers formed the Robo call strike force.

https://transition.fcc.gov/cgb/Robocall-Strike-Force-Final-Report.pdf

While its a plan, it’s imperfect because those using the system, know ways around the blocks.

https://arstechnica.com/tech-policy/2018/10/robocallers-evolved-to-sidestep-new-call-blocking-rules-...

Eventually true caller authentication will weed out legit from scam.  

https://www.mercurynews.com/2018/10/15/robocalls-finally-big-phone-carriers-to-take-promising-step-t...

   Daily news articles on the topic keep reporting a solution is on the way.  

Sign up for the do not call list online.  Don’t answer numbers you don’t know.  

Wow, that's a terrific answer. Thank you. I'll set up my phone as you suggested. Also found the AT&T app "Call Protect" and will give that a try.

@GrayEagle61

Unfortunately, this problem has become the number 1 topic posted on the forum.  It’s taken all the convience  out of having a cell phone (or landline)