I get about 20 robocalls a day, and I'm trying to figure out how to prevent unknown numbers from ringing my phone.
Have a silent ring and assign that to all non-contact callers. There is currently no way to mass assign a ring (to my knowledge), so this would be very labor intensive.
Use a Google voice number and let it do all the redirects.
Use Do Not Disturb but let text and notifications through from apps I want to use.
Has anyone found a good way to do dodge robocalls?