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Cell Phone Generations 1G, 2G, 3G and now 4G". Tech Forums. 25 August 2010 . Retrieved 16 October 2012. July 1920: World's first radiotelephone service commences public service between Los Angeles and Santa Catalina Island. [23] Amos E. Joel, Jr. of Bell Labs invented the "call handoff" system for "cellular mobile communication system" (patent granted 1972).
The geographic area codes 0700 to 0709 had only recently been moved to 01700 to 01709 on PhONEday. New 070 personal number allocations had to be chosen carefully such that mis-dialled calls for old pre-PhONEday geographic numbers would fail to connect rather than connect the caller to a user of a new personal number. Oftel identified old (070x) xx geographic number ranges that had not been used before and re-allocated those first.The history of mobile phones covers mobile communication devices that connect wirelessly to the public switched telephone network. a b c d e Allstot, David J. (2016). "Switched Capacitor Filters". In Maloberti, Franco; Davies, Anthony C. (eds.). A Short History of Circuits and Systems: From Green, Mobile, Pervasive Networking to Big Data Computing (PDF). IEEE Circuits and Systems Society. pp.105–110. ISBN 9788793609860. John F. Mitchell, [36] [37] [38] Motorola's chief of portable communication products and Cooper's boss in 1973, played a key role in advancing the development of handheld mobile telephone equipment. Mitchell successfully pushed Motorola to develop wireless communication products that would be small enough to use anywhere and participated in the design of the cellular phone. [39] [40] Early generations [ edit ] Lam, Crystal; Liu, Harry (22 October 2007). "How to conform to China's new mobile phone interface standards". EE Times . Retrieved 22 June 2010.
Shi, Mingtao (2007). Technology Base of mobile cellular operators in Germany and China. Univerlagtuberlin. pp.55–. ISBN 978-3-7983-2057-4 . Retrieved 30 December 2012. Edison, Thomas A. 1880. The Speaking Telephone Interferences, Evidence for Thomas A. Edison. Vol. 1 (jpg image), [cited 21 April 2006]. After the migration of geographic 0xxx area codes to new 01xxx codes on PhONEday (also 0xx → 01xx and 0xxxx → 01xxxx of course), some of the old area codes had started to be re-used for other purposes. For example, 0870 (Isle of Benbecula, Outer Hebrides) had been moved to 01870 and now 0870 started to be re-used for non-geographic services. Oftel had to issue a warning to operators to remove their "this number has changed, please redial inserting a one after the initial zero" messages that had been applied on PhONEday [55] so that callers could get through to the new non-geographic numbers. Bell Labs conducts extensive field trial of an electronic central office in Morris, Illinois, known at the Morris System. Hounshell, David A. 1975. "Elisha Gray and the Telephone: On the Disadvantages of Being an Expert", Technology and Culture, 1975, Vol. 16, No. 2, pp. 133–161.The first Australian telephone trials were made between Semaphore and Kapunda (and later Adelaide and Port Adelaide) in South Australia. [15]
The international access code also changed on "PhONEday", from 010 to 00 thus meeting the international call prefix standard set by the International Telecommunication Union (ITU). In the UK, Channel Islands and elsewhere the "Rabbit" phone system was briefly used, being a hybrid of "cell" base stations and handsets. One major limitation was that you had to be less than 300 feet (closer with buildings) from a base due to power limitations on a portable device. This timeline of the telephone covers landline, radio, and cellular telephony technologies and provides many important dates in the history of the telephone. Common Charging and Local Data Connectivity". Open Mobile Terminal Platform. 11 February 2009. Archived from the original on 29 March 2009 . Retrieved 11 February 2009.In December 1947, Douglas H. Ring and W. Rae Young, Bell Labs engineers, proposed hexagonal cells for mobile phones in vehicles. [20] At this stage, the technology to implement these ideas did not exist, nor had the frequencies been allocated. Two decades would pass before Richard H. Frenkiel, Joel S. Engel and Philip T. Porter of Bell Labs expanded the early proposals into a much more detailed system plan. It was Porter who first proposed that the cell towers use the now-familiar directional antennas to reduce interference and increase channel reuse (see picture at right) [21] Porter also invented the dial-then-send method used by all cell phones to reduce wasted channel time.
February 1876: Elisha Gray invents a liquid transmitter for use with a telephone, but he did not make one. Disney will offer mobile content". Media Week. 20 September 2005. Archived from the original on 2 September 2012 . Retrieved 16 October 2012. December 1877: Western Union enters the telephone business using Edison's superior carbon microphone transmitter.
April 1973: Motorola employee Martin Cooper placed the first hand-held cell phone call to Joel Engel, head of research at AT&T's Bell Labs, while talking on the first Motorola DynaTAC prototype.
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