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– patterns for checking which area codes and prefixes are valid and patterns for formatting each number type, archived in 2014 "The first 25 years of UK STD code changes summarised" (PDF). Sam Hallas. May 2014. – detailed information and explanation "Area codes as they were in the early 1990s".
Country codes are defined by the International Telecommunication Union (ITU) in ITU-T standards E.123 and E.164. The prefixes enable international direct dialing (IDD). Country codes constitute the international telephone numbering plan. They are used only when dialing a telephone number in a country or world region other than the caller's.
The original range of telephone numbers starting '03' was progressively cleared between 1995 and 2001: former geographic area codes starting 03 were renumbered to start 013 during the national PhONEday renumbering, while premium rate, local rate and mobile phone prefixes such as 0331, 0345, and 0378 were transferred to a simplified structure of ...
This is the format used by most areas. It has a four-digit area code (after the initial zero) and a six digit subscriber number, and is known as 4+6 format. These area codes were changed by adding a "1" directly after the initial zero as a part of PhONEday in 1995. Just short of 581 areas use this format, and the area codes range from 01200 to ...
What phone number can I call to report a spam call? You can call 888-382-1222 or visit DoNotCall.gov to report spam calls, telemarketers or robo-callers. Are 877 numbers spam?
Of the 16 area codes freed up for alternative use in the 1980s, at least 11 were re-used for other services. For example, the 0401 area code was re-allocated to Cellnet mobile services. Five of the area codes remained unused, including 01632, which is now partially reserved for fictitious telephone numbers. In 1995, the PhONEday changes for ...
Area code dialing is optional in most geographical area codes, except Moscow (area codes 495, 498, 499); it is mandatory for non-geographical area codes. E.123 international and Microsoft formats are used for writing local phone numbers as well; international prefix and country code 7 are replaced with trunk code 8 (or 8~CC ) when dialing a ...
Some widespread misunderstandings about area codes came about with the Big Number Change, most notably with London area codes. There is a widespread but erroneous assumption that London has several area codes – 0203, 0204, 0207 and 0208 – whereas, in fact, it has just one: 020. Similar misunderstandings came about with a few other area codes.