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This is a list of telephone dialling codes in the United Kingdom and the Crown Dependencies, which adopts an open telephone numbering plan for its public switched telephone network. The national telephone numbering plan is maintained by Ofcom, an independent regulator and competition authority for the UK communications industries. This list is ...
List of United Kingdom dialing codes In the United Kingdom, telephone numbers are administered by the Office of Communications ( Ofcom ). For this purpose, Ofcom established a telephone numbering plan , known as the National Telephone Numbering Plan , which is the system for assigning telephone numbers to subscriber stations.
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.
Subscribers on the 0803 exchanges dialled local codes beginning 8 to call numbers on the 0804 satellites; for example, a local code of 822 was used to dial from Torquay to Dittisham, whose STD code was 080 422. Meanwhile, subscribers on 0804 satellite exchanges used a mixture of codes beginning 8 to route calls on direct paths to nearby ...
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 ...
A subscriber would have to dial 0 for the operator and then request a long-distance call. As STD was introduced area by area the meaning of the 0 changed; it was now the trunk prefix used to raise a call automatically to the trunk dialling level, what telephone companies now call a National call. The new code of 100 was introduced for calling ...
The term subscriber trunk dialling is used in the United Kingdom, the Republic of Ireland, Australia, India and South East Asia. In the UK, the term is obsolescent, better known as the UK area codes. The introduction in the UK of subscriber dialling of long-distance calls removed the distinction that had existed between trunk and toll calls ...
In such administrations, the area code is not distinguished formally in the telephone number. In the UK, area codes were first known as subscriber trunk dialling (STD) codes. Depending on local dialing plans, they are often necessary only when dialed from outside the code area or from mobile phones.