Don't want to jinx anything, but in the last 2-3 months or so the number of phone-spam calls has dropped off to almost none, and we didn't do anything. I wonder if Sonic or some other agency has put better filtering in place.
We get several spam calls and a few nobody-there calls per day, still.
Far more junk than actual human phone calls.
As someone said above, email and telephone were nice while they lasted.