There were various types of telephones from tap dialling, candlestick phones, touch-tone phones, cordless phones. Over the years telephone has seen many changes. In 1931, the world’s first emergency service number came 999 in London, UK, which could only be dialled from the special police box.
But the long-distance call is still not possible, until 1958. Soon, the phone started between London and Paris giving birth to overseas phone calls in 1891. The first phone call is done by Graham Bell to his assistant “Minster Watson, come here, I want to see you.” The first phone lines run between Boston and Somerville, Massachusetts.
Invented back in mid-1800 by Alexander Graham Bell, the telephone is used for transmitting a message from one person to other. Without communication, we cannot not think of survival. The first hand-held mobile phone was introduced for personal service starting in 1973 by Motorola.Electronics and telecommunication play a prominent role in our life. For greater mobility, various radio systems were developed for transmission between mobile customer stations on ships and automobiles from the 1930s by the mid-1900s. This gave rise to landline telephone service in which each telephone is connected by a pair of dedicated wires to a local central office switching system, which developed into fully automated systems starting in the early 1900s. Being impractical beyond just a few customers, these systems were quickly replaced by manually operated centrally located switchboards. The first telephones were directly connected to each other from one customer's office or residence to another customer's location.
A telephone converts sound, typically and most efficiently the human voice, into electronic signals suitable for transmission via cables or other transmission media over long distances, and replays such signals simultaneously in audible form to its user. A telephone, or phone, is a telecommunications device that permits two or more users to conduct a conversation when they are too far apart to be heard directly.
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