US officials are urging Americans to make calls and send text messages over encrypted apps to minimize the risk of private information falling into the hands of foreign adversaries who might still be lurking in America’s telecommunications networks, NBC News reports.

A Chinese hacking campaign that spied on texts and calls of U.S. citizens is significantly larger than previously known to the public.

A US government security official urged Americans to use encrypted messaging as major telecom companies struggle to evict Chinese hackers from their networks. The attack has been attributed to a Chinese hacking group called Salt Typhoon.

US officials are still trying to help major telecom providers evict Chinese government-backed hackers from their networks and don’t have a timeline for when that will be done, officials said Tuesday.

U.S. government officials urged Americans to use encrypted messaging apps to avoid having their communications tapped by Chinese spies.

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.