I've noticed that my prepay burner phones, some of which I've kept in service for years, never receive robocalls. It's definitely not a blind system of calling

I've noticed that my prepay burner phones, some of which I've kept in service for years, never receive robocalls. It's definitely not a blind system of calling all numbers, you can have a robocall-free existence. I've simply never supplied the numbers for those phones to any personal information selling (or leaking) services/businesses, and that seems to effectively keep them off the call lists.