Salt Typhoon also compromised the private portals, or backdoors, that telephone companies provide to law enforcement to request court-ordered monitoring of phone numbers pursuant to investigations. - eviltoast
What is Salt Typhoon? A security expert explains the Chinese hackers and their attack on US telecommunications networks
theconversation.com
Chinese hackers are alleged to have broken into US phone networks, giving Chinese intelligence services a window onto specific Americans’ phone and messaging activity.