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Because of this, it has become common (but incorrect) practice to write telephone numbers used both nationally and internationally with the 0 in parentheses, for example: +44 (0)20 7946 0234; if the number is dialled with the parenthesised zero, the call will fail.
National conventions for writing telephone numbers vary by country. The International Telecommunication Union (ITU) publishes a recommendation entitled Notation for national and international telephone numbers, e-mail addresses and Web addresses. Recommendation E.123 specifies the format of telephone numbers assigned to telephones and similar communication endpoints in national telephone ...
Telephone numbers in Europe are managed by the national telecommunications authorities of each country. Most country codes start with 3 and 4, but some countries that by the Copenhagen criteria are considered part of Europe have country codes starting on numbers most common outside of Europe (e.g. Faroe Islands of Denmark have a code starting ...
This page was last edited on 13 April 2024, at 23:35 (UTC).
The UK Public Switched Telephone Network is divided up by area into National Number Groups (NNG's), and then further divided up into dialling codes . The structure of UK telephone numbers is a leading zero (replaced with +44 for international calls from outside the UK) followed by the NNG — a 2, 3, 4 or 5 digit dialling code (digits SA in the ...
In its full format (e.g. +44 70 0585 0070) an 070 number will be internationally recognisable as a UK number - even though it might in fact terminate to a mobile number anywhere - this feature is used in a variety of scams.
Therefore, all area codes have a preceding 0 (zero) when dialling from within the United Kingdom. When dialling a UK number from abroad the zero must not be included, but replaced by the calling country's international call prefix followed by the 44, the country code for the UK.
As telephone technology advanced, the precise significance of the prefix became blurred in many places; for instance, 485 in London, UK, was once the GULliver exchange, but now 44-20- 7485- xxxx is just considered one of many number blocks served by the CLKEN Kentish Town exchange. [1]
A telephone number is a sequence of digits assigned to a landline telephone subscriber station connected to a telephone line or to a wireless electronic telephony device, such as a radio telephone or a mobile telephone, or to other devices for data transmission via the public switched telephone network (PSTN), or other public and private networks. Modern smart phones have added a built-in ...
^ The number of digits that allow to uniquely identify a number within the country. It excludes the country code and any trunk code or access code. It includes the mobile prefix towards the total number of digits.