Comment by flyingshelf

Essentially useless. My country also banned them and has a "do not call" registry, doesn't stop scammers from calling my phone non-stop.

Also legally speaking all you need is "Check this box if you don't want spam" and the floodgates are open, legally.

You need telco-level detection and blocking. If a cellphone number makes 1000 calls today maybe it's not a real cellphone, is it. Block the calls.