U.S. government agencies will hold a classified briefing for all senators on Wednesday on China's alleged efforts known as Salt Typhoon to burrow deep into American telecommunications companies and steal data about U.

The FBI and Cybersecurity and Infrastructure Security Agency say that Americans should use encrypted apps such as iMessage and FaceTime to be safe from foreign hackers.

U.S. officials reveal that Chinese hackers are still lingering inside telecom networks and it's difficult to say when they will be identified and removed.

Amid an unprecedented cyberattack on telecommunications companies such as AT&T and Verizon, U.S. officials have recommended that Americans use encrypted messaging apps to ensure their communications stay hidden from foreign hackers.

Officials with the U.S. Cybersecurity and Infrastructure Security Agency and FBI went so far as to urge Americans to use encrypted messaging apps, according to a new report from NBC News, something that’s ostensibly about keeping foreign hackers out of your communications.

Officials from the FBI and CISA said it was impossible to predict when the telecommunications companies would be fully safe from interlopers.

The hacking campaign, dubbed Salt Typhoon, targeted dozens of telecom companies and remains "ongoing," U.S. security officials said.