Section 1: Electromagnetic Waves
James Clerk Maxwell proved the existence of electromagnetic waves in 1864, an important foundation for wireless technology. Sixteen years later, The world's first wireless telephone conversation occurred when Alexander Graham Bell and Charles Sumner Tainter invented and patented the photophone. The photophone was a telephone that conducted audio conversations wirelessly over modulated light beams (which are narrow projections of electromagnetic waves). The photophone was the first form of wireless communication.
Heinrich Hertz proved the existence of radio waves in 1888. Six years later, Guglielmo Marconi began developing a wireless telegraph system using radio waves. Radios were the best form of communication during the 1920's.
The first U.S. satellite to relay communications was Project SCORE in 1958, which used a tape recorder to store and forward voice messages. After commercial long distance telephone service was established via communication satellites, other commercial telecommunications were also adapted to similar satellites.
A mobile phone is a portable telephone that can make and receive calls over a radio frequency link while the user is moving within a telephone service area. The first handheld mobile phone was made by John F. Mitchell and Martin Cooper of Motorola in 1973. It weighed 4.4 pounds! The first commercial cellular system, led by Ameritech Mobile, began operating in Chicago, closely followed by the launch of a cellular system in Baltimore / Washington D.C. which was serviced by CellularOne. In March, 1983, the DynaTAC mobile phone launched using the first U.S. 1G network, serviced by Ameritech.
Today, cell phones are a widespread and useful device owned by 95 percent of Americans. It is the easiest and most common form of communication. Without the development of wireless and mobile, communication would be much different and more difficult.