90% of the phone calls out there are spam junk telemarketers.  The "National Do Not Call Registry", AARP, and probably the IRS just use their connection to mine phone numbers to sell to the scam people out there.  I have never heard of the do not call registry or the government EVER prosecuting anyone for calling people on the list.  And, AARP is a joke.  They give your name, address, dob, and phone numbers to every bs scam outfit out there.  We will never see the end of the calls as long as the list laws aren't enforced.