Do you receive unsolicited phone calls or SMS/text spam? I made a free public service site explaining how to find the telecom carrier that is responsible for the spammer's (real) phone number and report the abuse to them – so the carrier can terminate their service.
It works, and it feels like magic.
Background: Earlier this year, I wrote an HN comment[1] explaining how to find the telecom carrier responsible for a robocall or SMS spam campaign. Those steps aren't documented anywhere else, even though they're actually pretty easy.
This info deserved to be much more visible, so now it is: https://reportphonespam.org/
As my site says, most reputable telecom carriers don't want unsolicited messages on their network or phone numbers. In order to disconnect their abusive customers, they need to hear about the abuse. That's where you come in. In a few minutes, you can report abuse to the responsible carrier, who will investigate and often shut off the spammer's phone number(s).