The 4G (LTE) security cameras are the mobile monitoring cameras that use 4G LTE network to deliver live-view and send instant alerts. (Similarly, 2g/3g security cameras refer to the ones that work with 2g/3g network)
As the above definition indicates, 4G cellular CCTV cameras require a separate mobile service plan to work. And the cellular data consumption of 4G IP cameras varies, depending on how often you watch live streaming and receive motion detection alarms, etc.
Reolink Go is one of the best choice for the newly-emerged 4G surveillance cameras. You may refer to this article for more details.