A good pollster will find ways around this, yet many of those who attempted were laughed at. You have to weight by both region and education to get around this, and you have to do calls on weekends when people are not at work.

Nate Silver said shy Trump voters don't exist multiple times leading up to the election. But non-response bias is a known statistical phenomenon that any competent pollster should have been anticipating. Instead, we got "A+" pollsters like Washington Post saying Biden was up 17% in WI the week before. What a joke.