The mobile telecommunications industry is under significant threat. Today’s threats are a realisation of traditional IP based threats within the all-IP 4G network combined with insecure legacy 2/3G generations. Moving into the 5G era the threat landscape will increase due to the new services and technologies being introduced. Continued underinvestment in appropriate technology, processes, and people has resulted in numerous threats being realised against operators. These threats will only increase as the industry diversifies its services.