One of the easiest ways to provide 3G or 4G connectivity for your CCTV installation is by using a Fixed IP SIM Card with your 4G router. This means that you get the convenience of a mobile broadband Internet connection with a fixed, public IP address, so just like any router with an Internet connection with a fixed, public IP address you can connect to the router from anywhere on the Internet and use port forwarding to connect to your CCTV devices.
With a Fixed IP SIM card, it really is that simple.