> just as large voice service providers are required to since June 30, 2021.

So you're saying that, judging by the 3 spam calls I've gotten today on my (very large) phone carrier, these rules don't do very much.

The small phone companies are the ones sending the spam to you on whichever network you happen to use.

My understanding is that enforcement will start tomorrow. But I'm not especially familiar with the Telco environment. My understanding is also that there is still a remaining loophole for international telcos, which will close in another year's time.