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0114
0114 is the national dialling code for Sheffield in the United Kingdom. The area it serves includes almost all of the City of Sheffield and some adjacent areas. When STD codes were first introduced, Sheffield was assigned the mnemonic 0SH2 (which corresponded to 0742 on a rotary dial), later changing to the corresponding numbers upon the introduction of All-Figure Dialling in the area. Instead of the expected 01742 code, Sheffield's area code changed to the current 0114 code on 16 April 1995, along with 4 other cities in England (Leeds; 0113, Nottingham; 0115, Leicester; 0116 and Bristol; 0117), as part of PhONEday. All subscriber numbers within the area code consist of seven digits. The code is used at several telephone exchanges as part of a linked numbering scheme. In common with all other British area codes the initial '0' is a trunk prefix that is not required when dialling Sheffield from abroad.
==History==
Before 1965, Sheffield had 5-digit telephone numbers, with the first digit indicating the exchange area of the telephone line. Sheffield's 6-digit numbers were implemented by prefixing the original 5-digit numbers with a duplicate of the first digit (seen below), other than the 2xxxx numbers which were prefixed by 7 (as seen by the last example). This grouped telephone numbers centrally in the 1 to 9 range with a larger "buffer" at the extremes.〔http://stakeholders.ofcom.org.uk/telecoms/numbering/telephone-no-availability/numbers-administered/〕〔http://www.area-codes.org.uk/0114-area-code.php〕〔http://i27.photobucket.com/albums/c180/lbgradwell/Gordon004A.jpg Example of a 5-digit 2xxxx Sheffield telephone number which would become a 6-digit 72xxxx number, and then eventually the 7-digit number 272-xxxx〕
Switching to 6-digit numbers produced 90,000 available numbers for each exchange group, providing another 450,000 available numbers after combining both phases, producing a potential 500,000 numbers in Sheffield.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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