T-Mobile has revealed it was among the telecom providers hacked by a group reportedly tied to the Chinese government.

That, combined with reports that Chinese hackers had targeted telephones belonging to then-presidential and vice presidential candidates Donald Trump and JD Vance, along with other senior political figures, raised widespread concern over the security of America's telecommunications infrastructure.

The FBI and CISA previously said they were investigating breaches by a China-backed hacking group inside several telecommunications providers but had not said whether any data was stolen or whether the hackers accessed the systems used to fulfill legal wiretap requests.