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  1. Telephone numbers are of variable length. Local numbers are supported from landlines. Numbers can be dialled with a '0'-lead prefix that denotes either a geographical region or another service. Mobile phone numbers have distinct prefixes that are not geographic, and are portable between providers.

  2. Telephone numbers in the United Kingdom have a flexible structure that reflects their historical demands, starting from many independent companies through a nationalised near-monopoly, to a system that supports many different services, including cellular phones, which were not envisaged when the system was first built.

  3. Numbers beginning 01 or 02 are normal phone numbers for home and business telephone lines. These numbers are always split into two parts: The area code comes first, and is linked to a specific part of the country. For example, the 020 area code is for London and the 0121 code is for Birmingham.

  4. 1839. The world's first commercial telegraph line, using equipment invented by William Fothergill Cooke and Charles Wheatstone of King's College, London, was built between Paddington and West Drayton. It was working to Hanwell by 6th April and was completed to West Drayton on 9th July. This was also the first commercial use of electricity. 1941.

  5. A telephone number serves as an address for switching telephone calls using a system of destination code routing. Telephone numbers are entered or dialed by a calling party on the originating telephone set, which transmits the sequence of digits in the process of signaling to a telephone exchange.

  6. Jul 19, 2023 · Phone numbers serve as a unique address for a telephone, enabling communication between callers. Learn more about the history and evolution of phone numbers today.

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  8. Feb 7, 2021 · English. Map of telephone dialling area codes in the United Kingdom. Summary[edit] File history. Click on a date/time to view the file as it appeared at that time. You cannot overwrite this file. File usage on Commons. The following 4 pages use this file: User:Chumwa/OgreBot/Travel and communication maps/2019 June 21-30.

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