Under the new "mixed" arrangement, although 0387 and 03873 have the same first four digits, they are treated as completely separate area codes. All calls from one area to the other require the area code to be dialled. Local numbers in Dumfries cannot begin with a "3". Baker, Burton H. (2000), The Gray Matter: The Forgotten Story of the Telephone, Telepress, St. Joseph, Michigan, 2000. ISBN 0-615-11329-X Cell Phone Generations 1G, 2G, 3G and now 4G". Tech Forums. 25 August 2010 . Retrieved 16 October 2012. For example, the Newton Abbot GSC controlled an Adjacent Charge Group around the southern part of Dartmoor with no 'core' exchange, and all the STD codes in the group were five digits long based on code 0DN4 (0364). All the exchanges are now incorporated into a linked numbering scheme on the 01364 area code, officially assigned to Ashburton. [14] Original STD code and number format All that changed on April 3rd of 1973, when Martin Cooper, a Motorola executive, made the first handheld cell phone call. The guy he rang was his rival at Bell Labs.

The first automatic analog cellular systems ever deployed were NTT's system first used in 1979 for car phones in Tokyo (and later the rest of the country of Japan), and the cellular systems released by Comvik in Sweden in September, [41] [42] NMT in the other Nordic countries in October of 1981. Telephone production is halted at Western Electric until 1945 for civilian distribution due to the retooling of factories for military equipment during World War II. 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.Gonsalves, Antone (19 September 2005). "RealNetworks Launches Streaming Music on Sprint Phones". Information Week . Retrieved 16 October 2012. Izmerov, Oleg. "Отечественные Мобильники 50-Х"[Domestic Mobile Phones of the 50's]. Окно В Прошлое (in Russian). February 1880: The photophone, also called a radiophone, is invented jointly by Alexander Graham Bell and Charles Sumner Tainter at Bell's Volta Laboratory. [18] [19] The device allowed for the transmission of sound on a beam of light. Despite the capacity improvement offered by IMTS, demand outstripped capacity. In agreement with state regulatory agencies, AT&T limited the service to just 40,000 customers system wide. In New York City, for example, 2,000 customers shared just 12 radio channels and typically had to wait 30 minutes to place a call. [15] Radio Common Carrier [ edit ] A mobile radio telephone.

British companies Pye TMC, Marconi-Elliott and GEC develop the digital push-button telephone, based on metal–oxide–semiconductor (MOS) integrated circuit (IC) technology. [35] [36] It uses MOS memory chips to store phone numbers, which could then be used for speed dialing. [35] [36] [37] Farley, Tom (1 January 2006). "Cellular Telephone Basics". Privateline.com. Archived from the original on 5 December 2015 . Retrieved 30 December 2012. The number range 07624 xxxxxx was set aside for mobile telephones in the Isle of Man. This would also come into use as a part of the Big Number Change. March 1876: Bell first successfully transmits speech, saying "Mr. Watson, come here! I want to see you!" using a liquid transmitter as described in Gray's caveat, and Bell's own electromagnetic receiver.Yapp, Edwin (20 September 2005). "Mobile TV, anyone?". The Star. Archived from the original on 28 April 2006 . Retrieved 16 October 2012. Feldman, David (1989). When Do Fish Sleep? And Other Imponderables of Everyday Life. Harper & Row, Publishers, Inc. p.15. ISBN 0-06-016161-2. Thompson, Sylvanus P. (1883), Philipp Reis, Inventor of the Telephone, London: E. & F. N. Spon, 1883. Mohamed M. Atalla and Dawon Kahng at Bell Telephone Laboratories invent the metal–oxide–semiconductor field-effect transistor (MOSFET, or MOS transistor), [33] which later enables the rapid development and wide adoption of pulse-code modulation (PCM) digital telephony. [34] March 1885: The American Telephone & Telegraph Company (AT&T) is incorporated as the long-distance division of American Bell Telephone Company. It will become the head of the Bell System on the last day of 1899.

March 1880: National Bell Telephone merges with others to form the American Bell Telephone Company. Although mobile phones had long had the ability to access data networks such as the Internet, it was not until the widespread availability of good quality 3G coverage in the mid-2000s (decade) that specialized devices appeared to access the mobile web. The first such devices, known as " dongles", plugged directly into a computer through the USB port. Another new class of device appeared subsequently, the so-called " compact wireless router" such as the Novatel MiFi, which makes 3G Internet connectivity available to multiple computers simultaneously over Wi-Fi, rather than just to a single computer via a USB plug-in. and 0999 had never been used for geographic area codes, so could be used for non-geographic and mobile services as soon as the need arose. The prefixes listed in the table below were introduced at various times from the early 1980s to the mid-1990s. The details and timeline of these allocations is complex, and most have since migrated to various 07, 08 and 09 ranges in the Big Number Change. Thomas Edison experiments with acoustic telegraphy and, in November, builds an electro-dynamic receiver but does not exploit it. is the next version of cellular mobile telephone standards. The 5G standards include millimetre-band radio spectrum to allow data speeds up to 1 gigabit per second, and reduce latency (the processing time to handle a data transmission) between handset and network to a few milliseconds. 5G standards also include low-band and mid-band spectrum similar to existing networks. Telephone companies are introducing 5G technology starting in 2019.In all these early examples, a mobile phone had to stay within the coverage area serviced by one base station throughout the phone call, i.e. there was no continuity of service as the phones moved through several cell areas. The concepts of frequency reuse and handoff, as well as a number of other concepts that formed the basis of modern cell phone technology, were described in the late 1960s, in papers by Frenkiel and Porter. In 1970 Amos E. Joel, Jr., a Bell Labs engineer, [22] invented a "three-sided trunk circuit" to aid in the "call handoff" process from one cell to another. His patent contained an early description of the Bell Labs cellular concept, but as switching systems became faster, such a circuit became unnecessary and was never implemented in a system.