Will this KYC reduce spam and scam calls?

In theory, it could help. In practice, for KYC to reduce spam and scam calls, FCC would have to be willing to drop hammer big time on people and telcos who allow it to happen. With current political climate in the US, I don't see that happening since companies would scream "Poor pitiful us" and fines would be the cost of doing business.

Italy had forced KYC for all mobile numbers at least since the early 2000's and no, it doesn't fix the spam/scam calls problem at all.

No.

It did in every other country that did it. What's different about this one? If you get a spam call in Europe from Europe, you call the police and the spammer gets located and punished.

> It did in every other country that did it

Citation required.

SMS farm/machines don't work in the UK at least, I suspect not even in NL

Of course they do but every SIM is registered to your ID so it's extremely risky for you.

Europe does not consistently have KYC for phone service, at least for mobile connections. Normal phone companies in Ireland don't ask for information when buying SIMs (physical ones, at least). Some eSIM providers in Europe don't ask for information at all, and accept cryptocurrency payments. (I'm also aware that some other European countries have very different requirements, up to actually needing copies of identification.)

More widely, however, there do seem to be differences that I don't know the details of. VOIP seems quite different (I use it for my old phones): DID numbers in the US seem extremely cheap and available instantly, with little information, while European ones seem to have an actual verification process and prices that would make large-scale spamming difficult.

As an additional anecdote, I've never heard of a number-porting/2FA attack using social engineering or other methods in Ireland - but we have our own unique issues now with Robocalls and phishing on WhatsApp and SMS.

> It did in every other country that did it

Italy has mandatory KYC for all mobile numbers, and scam/spam calls are a common problem. So no, it doesn't fix the problem at all.

From Italy or from other countries?

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Has it?

Spam calls frequently don't have a source in the same country as their target victim.

No