This video I found on the Internet does a good job at explaining how mobile phones connect to their servers and how the big phone companies deal with having so many phones on one network by using multiple towers. This is definitely relevant because nowadays almost everyone has a mobile phone.
There are several key turning points in communications history. These are when a new technology comes out that allows us to communicate more effectively, through more area, to more people or just simply, more easily. The first of these was the telegraph. Up until this point in history, the only way human beings could communicate was face to face or through letters which had to be delivered. The telegraph allowed people to communicate across a large area of space almost instantly. The next was the telephone. Where the telegraph was instantaneous so was the telephone. But where the telegraph lack was that it could only transmit beeps and dots, a form of communication call Morse Code. The telephone allowed people to communicate to one another across a nation not only through beeps and dots, but through their own voice. Finally a granddaughter could hear her grandmother’s voice from half a country away, a mother could hear her son, a brother could hear his sister. Next was the radio which became a national pass-time in America. Families would sit around in the living room listening in on games, debates, news etc. But the radio did something for communication that the others before it had not done; for the first time a message could be heard by any number of people that decided to tune into the radio station. Mass communication was finally electromagnetic. After this there was cinema which allowed a visual aspect to be added to the viewer experience. Then there was television which allowed people to bring the visual aspect into their own homes.