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"Regular Expressions for Validating and Formatting GB Telephone Numbers". aa-asterisk.org.uk. Archived from the original on 6 April 2014 – 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.
This leads to a restriction as to which initial digits can be used for subscriber numbers within those four-digit area codes, e.g. in the 01387 four-digit area code, subscriber numbers cannot begin with a 3 because 013873 is a separate five-digit area code; likewise in the 01946 four-digit area code, subscriber numbers cannot begin with a 7 ...
An area code of three digits dialed after the country code determines the area served in the United States and its territories, Canada, and much of the Caribbean. Zone 2 uses two 2-digit codes (20, 27) and eight sets of 3-digit codes (21x–26x, 28x, 29x), mostly to serve Africa , but also Aruba , Faroe Islands , Greenland and British Indian ...
The 020 area code fully replaced older area codes for London on 22 April 2000, following multiple telephone number changes during the 1990s. [notes 1] As is the case for other codes in the UK, the 020 area code may also be used for services without any physical presence in the area, such as private networks or virtual numbering. [1]
This was because some French exchanges had alphabetic codes including Q, but in the event France moved to all-digit codes before direct dialling from the UK was introduced. The use of alphabetic exchange (area) codes was abandoned in the UK in 1966 in favour of all figure numbering.
When dialling a UK number from abroad the zero is omitted and replaced by the calling country's international call prefix followed by 44, the country code for the UK. Thus a call to the Euston exchange discussed above from the United States would be to 011 (US international prefix) 44 20 (London) 73871234.
Except for short codes and emergency numbers, all telephone numbers in Sri Lanka have ten digits (initial 0 + nine numbers). Landline phone numbers begin with the area code, then one digit for the operator code, then six digits for the primary telephone number. Format: (XXX Y ZZZZZZ) where: "xxx" denotes the area code.
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 .