Given that mobile communications is a prime target for hackers who desire to penetrate critical infrastructures and businesses, mobile operators must define and implement protective measures quickly to safeguard their networks before subscribers, organisations, and even governments fall prey to misuse. Exploring SS7 fraud that threatens mobile network security and subscriber privacy, exposes the vulnerabilities and threats that are impacting the SS7 signalling network, the exploitations that can take place today and the measures operators can put in place to solve this growing security issue.