As AI, 5G, and smart cities evolve, critical digital infrastructure increasingly relies on public mobile networks for deployment, including EV charging stations, smart grids, transportation, and smart poles. However, this shift in Industrial IoT for public mobile environments exposes more devices to external threats, expanding attack surfaces, accelerating real-time threats, and heightening potential risks. Cyberattacks on IIoT infrastructure—such as power grids, transport, and communications—could cause severe disruptions. This session explains the security gap between IIoT and enterprise networks, presenting a strategic defense framework to strengthen IIoT resilience against evolving cyber threats.