Early development.
- 1871, Meucci Natonio patented his invention called sound Telegraph. Discovery to allow for communication in the form sound between two people using the intermediary cable.
- 1875, The Bell telecommunications companies to get patents on Meucci invention called Transmitters and Receivers for Electric Telegraphs. The system uses multiple vibration of steel to provide pause on the circuit.
- 1876, the Bell company's patented Improvement in Telegraphy. This system provide a method for transmitting voice telegraph.
- 1877, The Charles Williams Shop is the place where the first telephone times made with the supervision of Watson, who later became the department research and development of the telecommunications company. Alexander Graham Bell continues to monitor the productivity of the company so that the end of the year as many as three hundred phone can be used. Bell companies also has patented a phone that uses electro-magnetic magnet permanent, iron diaphragms, and the ringing call.
- 1878, the board found a replacement manually enabling many telephone exchanges are connected via a channel. under leadership of Theodore N. Vail, the Bell company has 10,000 telephone which can be used.
- 1880, the first metallic circuits installed. This circuit is perbaharuan of one-wire circuit into a two-wire. This helps reduce Perbaharuan disorder that is often felt with the use of one-wire line.
- 1891, dial the phone number is first used. The phone will work automatically connects callers to an operator by pressing dial numbers based instruction.
- 1915, a phone with a wireless system was first used. This system allows phone users to interact across borders.
