Big Number Change

telephone numbering system
The Big Number Change addressed various issues with the telephone dialing plan in the United Kingdom, during the late-1990s and early-2000s.wikipedia
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Telephone numbers in the United Kingdom

+440141dialling code
The Big Number Change addressed various issues with the telephone dialing plan in the United Kingdom, during the late-1990s and early-2000s.
The Big Number Change removed many, especially in Northern Ireland, and by July 2005 there were only 329 ranges in 42 codes.

PhONEday

16 April 1995Phone Day
In 1995, PhONEday partially addressed this by altering all geographic area codes to begin 01, freeing up hundreds of codes beginning 02 to 09 for other uses.
The PhONEday changes also released space for new geographic area codes beginning 02, which would come into use as part of the Big Number Change in 2000.

Cardiff

Cardiff, WalesCaerdyddCity of Cardiff
The change affected the dialling codes assigned to Cardiff, Coventry, London, Northern Ireland, Portsmouth and Southampton, culminating in a large switch on 22 April 2000.
Prior to the Big Number Change on 22 April 2000 the area had shorter, six-digit local numbers with an area code of 01222 (with 0222 preceding this, prior to May 1995).

Northern Ireland

Northern IrishIrishNIR
The change affected the dialling codes assigned to Cardiff, Coventry, London, Northern Ireland, Portsmouth and Southampton, culminating in a large switch on 22 April 2000.
In 2000, the telephone numbering system was restructured into an 8 digit scheme with (except for Belfast) the first digit approximately reflecting the county.

UK telephone code misconceptions

common misconceptionerroneous UK telephone codesmisquoted
Similar misunderstandings came about with a few other area codes.
Widespread UK telephone code misconceptions, in particular brought on by the Big Number Change in 2000, have been reported by regulator Ofcom since publication of a report it commissioned in 2004.

List of dialling codes in the United Kingdom

Dialling codesDialling code01439
01426, 01523 and other non-standard 01 prefixes were briefly used for pagers in the late 1990s and then moved to new 076 prefixes in the Big Number Change in 2000/2001.

020

London telephone area+44 2001
There is a widespread but erroneous assumption that London has three area codes 0203, 0207 and 0208, whereas in fact it has just one: 020.
After a sequence of changes in the 1990s, culminating with the Big Number Change, the current 020 code became active on 1 June 1999.

Lisburn

BallymacashLisburn, Northern IrelandLisburn, Ireland
Before the Big Number Change in 2000, the STD code for Lisburn and its surrounding area was 01846, having previously been 0846.

Coventry

Coventry, EnglandCity of CoventryCoventry, West Midlands
The change affected the dialling codes assigned to Cardiff, Coventry, London, Northern Ireland, Portsmouth and Southampton, culminating in a large switch on 22 April 2000.

London

London, EnglandLondon, United KingdomLondon, UK
The change affected the dialling codes assigned to Cardiff, Coventry, London, Northern Ireland, Portsmouth and Southampton, culminating in a large switch on 22 April 2000.

Portsmouth

Portsmouth, EnglandCity of PortsmouthPortsmouth, Hampshire
The change affected the dialling codes assigned to Cardiff, Coventry, London, Northern Ireland, Portsmouth and Southampton, culminating in a large switch on 22 April 2000.

Southampton

Southampton, EnglandSouthampton, HampshireCity of Southampton
The change affected the dialling codes assigned to Cardiff, Coventry, London, Northern Ireland, Portsmouth and Southampton, culminating in a large switch on 22 April 2000.

Subscriber trunk dialling

STDSTD codesubscriber trunk dialing
When STD codes were introduced in the 1950s, Northern Ireland was allocated only 14 area codes for 34 charging groups.

Counties of Ireland

CountycountiesIrish counties
Note that the new numbering scheme groups numbers together such that the first digit identifies the county in alphabetical order.

Belfast metropolitan area

Greater BelfastBelfastBelfast Urban Area
The exception is the Greater Belfast area where all numbers begin with 9, regardless of the county.

Ballymena

Ballymena, County AntrimHarryvilleKilconriola

Ballymoney

Ballymoney Primary SchoolLandhead Primary SchoolLislagan Primary School

Portadown

Ballyoran Primary SchoolPortadown Integrated PrimaryPortadown Integrated Primary School