It's easy now. It was an unsolved problem two decades ago.
And it's not like there's no technical means for the phones either. Just enforcing caller ID would go a long way to curtail spam. Like in our great Red Tape Europe, even with uptick in recent years we have a tiny fraction of spam calls compared to the United States.
> And it's not like there's no technical means for the phones either. Just enforcing caller ID would go a long way to curtail spam.
A) this is insanely naïve given the international treaties that make up telecommunication agreements. B) "Just enforcing caller ID would go a long way to curtail spam." telecoms don't have any clue who is calling, see above comments about treaties.
I was replying to the comment asserting that dealing with email spam is easier, which it most resolutely wasn't until the advent of statistical filters.
> A) this is insanely naïve given the international treaties that make up telecommunication agreements.
Fun thing about treaties and agreements is they are not laws of nature and can be entered, abandoned and amended at will. A lot of regulation is getting constantly updated.