The Marconi system made a radio link between systems, which was the size of a building. Eventually, people put up a radio system at a high point in the city, then those with the right kind of radio could talk to the high point.
In essence, there was only one cell, even though it wasn't cellular in any sense. But the amount of data you could send depended on how far away you were. The desire was for these cells to get closer together, leading to the invention of the cellular system.
It is not certain which technologies developed now will be used in 6G networks, but the following are possibilities:
Phones need to be close to the base station for a good signal. Many cell towers mean you can talk to the one that's closest to you.
What is amazing about the development of cellular systems is that it automatically switched which base station the phone talks to as its location changed.