The infrastructure supporting the global phone system, especially in the case of traditional landlines, was built decades ago, before modern encryption standards became widespread. While mobile networks and VoIP services have added encryption layers, much of the system is still vulnerable to eavesdropping, interception, and surveillance by bad actors. For instance, the Signaling System 7 (SS7), a protocol that underpins much of the global telephone network, has been exposed as having multiple security loopholes that allow hackers to intercept calls and messages.