When the Chinese hacker group known as Salt Typhoon was revealed last fall to have deeply penetrated major US telecommunications companies—ultimately breaching no fewer than nine of the phone carriers and accessing Americans' texts and calls in real time—that hacking campaign was treated as a four-alarm fire by the US government. Yet even after those hackers' high-profile exposure, they've continued their spree of breaking into telecom networks worldwide, including more in the US.Researchers at ...