Believe it or not, cell phones have a longer history then the radio. Cell phones started off in the 1920's and radios were first used in 1921. Some of the cell phone features were used in radios way back in the 1940s. Police used these radios.
The idea of the cellular phone was developed in 1947 as a mobile car phone. Bell Laboratories (also known as Bell Labs and formerly known as AT&T Bell Laboratories and Bell Telephone Laboratories) produced the concept of the cellular phone by introducing cells for mobile phone base stations. Russell Ohl developed the photovoltaic cell (a device that converts light energy into electrical energy.) In 1943, Bell developed SIGSALY (also known as the X System, Project X, Ciphony I, and the Green Hornet), the first digital scrambled speech transmission system used in World War II for the highest-level Allied communications. SIGSALY is not an acronym. It was intended to look like an acrynim but it was just a cover name. SIG was common in Army Signal Corps names. The prototype was called Green Hornet because it sounded like a buzzing hornet to anyone trying to eavesdrop on the conversation. Motorola has a long history of making automotive radio, especially two-way radios for taxicabs and police cruisers. The first actual cell phone was invented in 1973 by Martin Cooper of Motorola and other assisting inventors. It was called the "radio telephone system." He used the idea of the car phone and applied the technology required to make a portable cell phone a reality.
While people were walking on a New York City street in 1973, Cooper made the first portable call on a cell phone. A prototype called Motorola DynaTac was used. Joel Engel was the person he made the call to. From this, the technology and communications market shifted from the place and to the person.
In Chicago 1978, the first commercial cellular network using the AMPS (Advanced Mobile System) was introduced. The mobile phone was known as analog. In North America the analog mobile phone system became the one used and ans is still widely available but to various digital standards being introduced is has become less desired.
Cell phones were first made available to the public in 1984 although they were very large, expensive instruments. The Federal Communications Commission worked together with AT&T and Bell Towers to establish broadcast towers. The towers were small with little power and covered a "cell" that was actually only a few miles in radius but could cover a larger area. Towers allowed calls to transfer from tower to tower.
Today worldwide the GPS cell phone is being known.
