"Chinese hacker cyber espionage breaks down all three major U.S. telecommunications companies"

In addition to major U.S. mobile carriers Verizon and AT&T, Chinese hackers have also used T-Mobile for cyber espionage, the Wall Street Journal reported.

T-Mobile, in addition to Verizon and AT&T, was also among the infiltration by "Salt Typhoon," a hacker group linked to the Chinese government, to access information on key political and political personnel calls, the newspaper reported, citing sources.

As a result, all three major U.S. telecommunications companies were found to have been breached by Chinese hackers' cyber espionage activities.

A T-Mobile spokesperson said the cyberattack was being closely monitored, adding that the T-Mobile system and data were not seriously affected and there was no evidence it had affected customer information.

Salt Typhoon infiltrated through vulnerabilities in mobile communications infrastructure, including routers from U.S. network equipment company Cisco Systems, and is suspected of applying artificial intelligence technology to improve its ability to spy, the Wall Street Journal said.

Earlier, the Federal Bureau of Investigation issued a joint statement saying a wide range of and significant cyber espionage activities targeting commercial mobile networks had been revealed.

In particular, he pointed out that actors linked to the Chinese government infiltrated a number of mobile carrier networks, stealing customer call records and violating private calls between government and political figures.