Spectrum is finite though. You can add more fixed clients by adding more hardware at the CO and running more fibre. Eventually, even if no one is even actively downloading, your cellular network will saturate just from the number of clients.
The same is true of wireless networks today. An 802.11n wifi network is also limited by the number of clients, even if none of them are consuming their share of bandwidth.
The same is true of wireless networks today. An 802.11n wifi network is also limited by the number of clients, even if none of them are consuming their share of bandwidth.