Cell Phones and Smartphones
A Tidbit Of History
Early predecessors of cellular phones included analog radio communications from ships and trains. In 1917 Eric Magnus Campbell Tigerstedt, a Finland inventor, filed a patent for the pocket-sized folding telephone. The telephone included a very-thin carbon microphone”. After World War II (9/1/1939 to 9/2/1945), the race to truly create portable telephone devices began. The zeroth-generation (OG) services, known as the Bell System’s Mobile Telephone Service and its successors, the Improved Mobile Telephone Service, started the advances in mobile telephony. The OG systems were not cellular, supported few simultaneous calls, and were very expensive.
Metal-oxide-semiconductor (MOS), large-scale-integration (LSI) technology, information theory, and cellular networking led to the development of affordable mobile communications. In 1973, John F. Mitchell and Martin Cooper of Motorola gave the first handheld cellular mobile phone demonstration. The handset weight, 4.4 lbs. Click Here to learn more about the history of cellular phones.