China's mass surveillance has been widely acknowledged by intelligence communities. With the country's advancement in technology, its communist government has broadened its spy network through digital means - mobile apps and hacking tools exploiting vulnerabilities and facial recognition besides conventional methods beyond mainland China. But now, according to a report, China is allegedly spying on American citizens through telephone networks in the Caribbean.

A former mobile network security executive, Gary Miller from Washington, has claimed that China has been allegedly exploiting vulnerabilities in the telephone network to route communications, allowing it to track, intercept and target communications of American mobile phone users. Miller, who was working for mobile security company Mobileum, started his company Exigent Media, a cybersecurity research firm. He said he wanted to expose the "severity of this activity" and help deploy countermeasures.