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The format of telephone numbers in Australia has changed over time to allow for the expansion of the subscriber base as technology has improved. ==Introduction of area codes (pre-1990s)== The introduction of subscriber trunk dialling was slow, partly because of the distances of exchanges in some areas and partly due to the use of manual exchanges well into the 1980s. Initially, area codes covered a very small area, sometimes only one exchange, but gradually exchanges conglomerated to become area codes. The length of codes varied, from two digits in large centres like Sydney to three digits in smaller areas. Kangaroo Island had a 4 digit code. As early as 1971, some localities had area codes as long as seven digits, while the state capitals had two-digit area codes. By 1989, the system had been standardised.〔http://web.archive.org/web/20050204164939/http://phonebooks.ummm.net/areacodes.html〕 The digit following the leading zero was chosen to represent a rough geographic area, with the following numbers: * 00: Tasmania (but also used for emergency (000), freecall (008), premium rate (0055), international access (0011) and other special numbers) * 01: Mobile phone, pager, information and operator services * 02: Sydney * 03: Melbourne * 04: New South Wales regional areas roughly within 250 km of Sydney (from 1992 041x was/is used for GSM mobile phones) * 05: Victoria regional areas * 06: Australian Capital Territory and New South Wales regional areas outside the 04 codes * 07... Queensland * 08... South Australia and the Northern Territory * 09... Western Australia, Christmas Island'' *'' and the Cocos Keeling Islands'' *'' '' *'' Until 1994, these territories were not part of the Australian numbering plan, and instead used the code 672, for the Australian External Territories of Norfolk Island and the Australian Antarctic Territory. Numbers in use before 1994 are now in the number ranges of 08 9162 for Christmas Island and 08 9164 for the Cocos Keeling Islands, but other ranges are now used on the islands (at least in theory). The original phone number formats for the islands were +672 2 xxxx for Christmas Island and +672 4 xxxx for the Cocos Islands. By 1994, there were 6 area codes of two digits covering Sydney (02), Melbourne (03), Canberra (06), Brisbane (07), Adelaide (08) and Perth (09), 48 area codes of three digits, from (002) covering Hobart to (099) covering mid-west Western Australia, and one area code of four digits, Kangaroo Island (0848), which was not incorporated into a larger area code before 1994. To dial these numbers from overseas, one omitted the leading zero. In the case of numbers in the 00 range, only the first zero was omitted: Hobart was +61 02 xx xxxx this was a potential cause of confusion with the Sydney area code (+61 2 xxx xxxx or +61 2 xx xxxx). The 007 range was used for satellite phones and "0G" mobile phones.〔http://www.gizmodo.com.au/2011/08/australia-made-its-first-mobile-call-30-years-ago-today/〕 Even as late as 2005 there was confusion: the prefixes +61 78 and +61 79 were listed as a "mobile phone number" on some call rates,〔http://whrl.pl/RIAoT〕 even though the prefix was +61 07x and had not been used for over a decade. In late March 1990, Canberra's area code changed from (062) to (06) by integrating the 2 into the subscriber number, thus allowing 200 000 more numbers to be registered. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Former Australian dialling codes」の詳細全文を読む スポンサード リンク
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