Comment by throwaway894345

How does it work, technically? In the US we have something that is supposed to be similar--put your number on a registry and telemarketers can't legally call you--but in practice we've just built a list of real phone numbers that telemarketers and scammers can use to target numbers that are owned by real people rather than brute-forcing the entire phone number space. If there is any enforcement at all, it's imperceptible.