I’m going to guess that it’s some advanced, ‘Big Brother Tracking Device.’
How close am I? ;)
Probably closer than you intended...............
As it happens, I’m a cellular engineer with the company that’s probably the closest to 5G.
It’s no more big-brothery than any other cellular technology, but it is a very different concept. Rather than relying on macro-cells (towers) exclusively, the 5G network will use many microcells on things like streetlights and telephone poles that allow for low power very short range communication at very high speeds.
The important thing to understand is that the 5G standard is still under heavy development, and it’s further than a year or two away before being realized. Once it’s ready to deploy, however, most users are looking at gigabit speeds with many possible options for connecting to the cellular network. It will probably also replace any cable or fiber internet most people have to their house as well.