The U.S. is facing a significant cybersecurity threat from a Chinese hack targeting telecom companies, potentially intercepting phone calls and text messages. This has led to an unprecedented FBI warning, urging consumers to protect their communications with encryption. The hack, named 'SALT TYPHOON' by Microsoft, is considered an espionage campaign, with potential targets including high-profile political figures and campaigns. The FBI and CISA recommend using end-to-end encryption apps like Signal or WhatsApp to secure messages, especially when communicating between different phone types. Despite the severity of the hack, many affected individuals remain unaware due to lack of notification from telecom providers. The outdated telecom infrastructure is highlighted as a vulnerability, and the FBI's endorsement of encryption marks a shift in their stance, emphasizing the need for secure communication practices.