Links to know to be "in the know"

For a more extensive list of call blocking apps, see also:   
http://www.ctia.org/consumer-tips/robocalls/android-robocall-blocking

FCC:
https://www.consumer.ftc.gov/scam-alerts
https://www.fcc.gov/consumers/unwanted-calls
https://www.fcc.gov/general/complaints

National Do Not Call Registry:
"Do Not Call"  / Registering your number will reduce telemarketing calls from legitimate companies.
 
Better Business Bureau: 
https://www.bbb.org/scamtracker/usa  (enter “Robo calls” or “telemarketing” in keyword search  
  
Consumers Union:  
https://consumersunion.org/end-robocalls/
    
AARP:  
http://blog.aarp.org/tag/robocalls/     
http://www.aarp.org/about-aarp/contact-us/

Charity Navigator:  
https://www.charitynavigator.org/index.cfm?bay=content.view&cpid=224
 
Consumer Watchdog: 
http://www.consumerwatchdog.org/
 
Fraud.org    
http://www.fraud.org/