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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.
The 0800 range can have NSN length as 10, 9, or 7 digits. The 0845 range can have NSN length as 10 or 7 digits. The 0500 range had NSN length as 9 digits only, and was withdrawn from use on 3 June 2017. All other UK numbers have NSN length of 10 digits. There are no telephone numbers in the UK with an NSN length of 8 digits.
The letter O became a zero, such as for Bournemouth: 0BO2 where BO = 20. To help the public remember the new codes they were initially advertised using this alphanumeric combination of 0 followed by two letters and at least one number. From 1966 all STD codes were displayed as numbers only.
Subscriber trunk dialling (STD), also known as subscriber toll dialing, is a telephone numbering plan feature and telecommunications technology in the United Kingdom and various Commonwealth countries for the dialling of trunk calls by telephone subscribers without the assistance of switchboard operators.
A standard United Kingdom fixed telephone number (i.e. a landline, or geographical number, as opposed to a mobile telephone number or special rate non-geographic fixed line) is divided into three parts, the trunk prefix code (0 in the UK), an STD code (area code) followed by a local number. The STD (Subscriber Trunk Dialling) code indicates the ...
Worldwide distribution of country calling codes. Regions are coloured by first digit. Telephone country codes, but also sometimes referred to as country dial-in codes, or historically international subscriber dialing (ISD) codes in the U.K., are telephone number dialing prefixes for reaching subscribers in foreign countries or areas via international telecommunication networks.
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From 1966, UK telephone dialling codes ceased to be represented with letters. In most areas this did not require any changes to the telephone codes or numbers, e.g. the Sevenoaks STD code changed from 0SE2 to its numerical equivalent 0732.