ABSTRACT
The telephone is the ancestor of the cell phone, so it is advisable to ”rst learn something about the history of the telephone. The telephone was invented in 1876 by Alexander Graham Bell. In 1877, President Rutherford B. Hayes had a telephone installed in the White House. By 1878, there was a commercial telephone exchange in New Haven, Connecticut with 21 subscribers and 8 landlines [1]. People could then make and receive calls with the limited number of people who had a telephone. The telephone then grew in popularity as millions of people worldwide became subscribers. One serious complaint about the telephone was that one had to be within earshot of the bell ringer to hear and answer a call.
