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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.
For example, numbers in Dumfries already used (0387) 2 and (0387) 5, while numbers in Langholm were 4 or 5 digits long and used the 0541 area code. Langholm numbers were changed to 5 digits and transferred to the newly created 03873 area code.
Writing telephone numbers: Phone number: Note +380 44 123 45 67 E.123, international format: country code, settlement code and telephone number are separated by spaces (044) 123 45 67
When dialling a UK number from abroad, the zero must be omitted. 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.
A non-geographic number is a type of telephone number that is not linked to any specific locality. Such numbers are an alternative to the traditional 'landline' numbers that are assigned geographically using a system of location-specific area codes.
Fictitious numbers in (011x) and (01x1) area codes mostly end with the digits 496 0xxx, however Tyneside uses (0191) 498 0xxx. London uses 020 7946 0xxx; Cardiff uses 029 2018 0xxx; and Northern Ireland now uses 028 9649 6xxx after a previously reserved range was allocated for actual use.
E.164 is an international standard ( ITU-T Recommendation), titled The international public telecommunication numbering plan, that defines a numbering plan for the worldwide public switched telephone network (PSTN) and some other data networks . E.164 defines a general format for international telephone numbers.
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E.164 specifies that a telephone number consist of a country code and a national telephone number. National telephone numbers are defined by national or regional numbering plans, such as the European Telephony Numbering Space , the North American Numbering Plan (NANP), or the UK number plan .
A telephone number serves as an address for switching telephone calls using a system of destination code routing. [1] Telephone numbers are entered or dialed by a calling party on the originating telephone set, which transmits the sequence of digits in the process of signaling to a telephone exchange.