- 7th cen AD: acoustic string phone in Peru
- 1667: acoustic string phone created by Robert Hooke
- 1804: electrochemical telegraph
- 1816: working telegraph
- 1839: commercial telegraph
- 1854: Meucci telephone
- 1861: Reis telephone
- 1875: electro-dynamic receiver
- 1876: water microphone telephone
- 1876: practical telephone
- 1877: carbon transmitter
- 1877: long-distance telephone line
- 1878: commercial telephone exchange
- 1887: multiplex switchboard
- 1890s: candlestick telephone
- 1892: rotary dial
- 1927: transatlantic phone call
- 1957: transatlantic direct dial phone call
- 1963: Touch-Tone
- 1973: cell phone
- 1973: Voice over Internet Protocol
- 1980: CMOS PCM codec-filter chip
- 1992: smartphone
- 2007: iPhone
Sources
