The declaration follows recent news of an incident where Salt Typhoon, an infamous Chinese state-sponsored threat actor, breached T-Mobile's network in a cyber-espionage campaign on behalf of the country’s government.

T-Mobile says the Chinese "Salt Typhoon" hackers who recently compromised its systems as part of a series of telecom breaches first hacked into some of its routers to explore ways to navigate laterally through the network.

The statement followed reports about "Salt Typhoon," a Chinese-linked cyberespionage operation targeting U.S. telecommunications firms. T-Mobile Chief Security Officer Jeff Simon said in a blog on the company's website Wednesday that the company detected ...