China is ‘spying on Americans via Carribean networks’

The transcript discusses China's alleged espionage on U.S. citizens through Caribbean phone networks, based on research by Gary Miller. China reportedly uses state-controlled operators to send signaling messages to U.S. subscribers, often when they are abroad. These messages, typically used for connecting users, can also track and monitor communications. China is said to favor targeted espionage, leveraging its ties with Caribbean countries to conduct these activities.

What are signaling messages and how can they be misused?

What recent trends in espionage tactics has China adopted according to Miller?