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The UK telephone numbering plan, also known as the National Numbering Plan, is regulated by the Office of Communications (Ofcom), which replaced the Office of Telecommunications (Oftel) in 2003.

Format

General Format

Following the changes in 1995, 2000 and 2001, the numbering range in use is as follows. Note that the initial "0" of a telephone number (called the trunk prefix) is not properly considered part of the area code but is, rather, the national long distance calling prefix, and thus (for example) 023 is a "two-digit" area code.

Calls originating in the UKThe leading "0" is only required for calls originating in the UK. Likewise, "00" is the UK dialing prefix for international calls (to be followed by the international country code and number). Calls originating from outside the UKNote: The leading "0" should be omitted for all international calls and replaced with the international country code for the UK: +44. Best 4 Systems.

Geographic numbering

(01xxx) xxx xxx — a four digit area code and six digit subscriber number. The break is placed in the middle by convention but this does not reflect normal allocation blocks. e. g:(01x1) xxx xxxx — the geographical number format for the larger cities, a three digit area code, with a seven digit subscriber number where the first three digits identifies an area within the city. (011x) xxx xxxx — the geographical number format for a second tier of large cities, a three digit area code, with a seven-digit subscriber number, e. Home office office 2000 office supply store wholesale office supplies virtual offices london office supplies labels office furniture new york viking office supplies medical office scheduling office rentals office equipment rentals prefabricated office california loan officer training office supplies folders office laminator wholesale office chairs modular office trailer short term office space office space in orlando office scheduler office furniture conference room office furniture cubicle retail office space office lighting fixtures office visio 2003 loan officer online course dental office plan austin furniture office texas used plantronics cs50 wireless office headset virtual office san francisco miami office rent space angeles los office virtual forex currency trading system barebone systems surveillance systems inventory management system stock trading systems management information systems database management system video security systems hair removal system future trading system currency day system trading business process management system labeling system