Over short distances, with little interference, and with few devices, sending data via radio waves is comparatively cheap. Over longer distances, with lots of interference, to many devices, and with the devices constantly leaving one cell tower’s area and switching to another, it gets much more expensive.
Sending the data to your house or business using a cable or fiber is pretty cheap. Once it reaches your location, you can then use the fairly cheap WiFi to send it to the small number of devices at your location. At short distances you can also work around or overcome interference pretty easily as well.
Mobile data has to work with a lot more devices, in a much noisier environment, with the devices jumping from one tower to another all the time, and at much greater distances than WiFi. As a result, it is a lot more expensive.
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