AT&T robocall blocking service

Is it true that it will block ALL robocalls? Or is this just false hope? I would pay 4 dollars if it blocked ALL robocalls...AT&T folks is this actually a good service or is it like any other robocall service out there that pretty much sucks half of the time? https://www.cbsnews.com/news/at-t-free-robocall-blocking-service-comes-with-a-4-monthly-catch/