As finn. I can verify scam calls are non-existent lately few do occasinally popup, but its like 2000 times better than before. When i learned about this originally, i was shocked like how this is not default?
Gotta remember the phone system used to run on electromechanical relays not digital systems and the digital upgrades since then were designed to be compatible with the old systems with common carrier rules requiring networks to route calls by default so blocking and verification weren't really built into any of the systems and interfaces between carriers.