020

London telephone area+44 200101 (telephone number)adjacent areasLondonLondon telephone area codeLondon Telephone Service
020 is the national dialling code for London in the United Kingdom.wikipedia
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List of telephone exchanges in London

170 telephone exchanges
The code is used at 170 telephone exchanges as part of the largest linked numbering scheme in the United Kingdom.
The following exchanges are located outside Greater London, but use the London 020 dial code.

Linked numbering scheme

linked-number area
The code is used at 170 telephone exchanges as part of the largest linked numbering scheme in the United Kingdom. The Director telephone system was developed so that subscribers in London could call one another in a linked numbering scheme regardless of whether they were on a manual local exchange or an automatic one.
The largest linked numbering scheme in the UK is that for the London telephone area, formerly known as the London Director area.

PhONEday

Phone Day
In 1995, on "PhONEday", the codes changed again, to 0171 and 0181.
PhONEday followed a change made in May 1990 when the old London area code 01 had been released from use, permitting all United Kingdom geographic numbers to begin with this prefix.

All-figure dialling

all figure dialling01609All Figure Numbering
With the change to all-figure dialling in 1966, the system of mnemonics was withdrawn and the three-digit local exchange codes of many subscribers were altered.
In most areas the change initially only affected the presentation of area codes, but in six multiple exchange director areas such as the London telephone area, the change required the introduction of new local exchange codes.

Big Number Change

telephone numbering system
After a sequence of changes in the 1990s, culminating with the Big Number Change, the current 020 code became active on 1 June 1999.
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.

Loughton

Oaklands SchoolLoughton ''HomebaseLoughton Campus
Communities outside Greater London that are within the code are Buckhurst Hill, Chigwell, Loughton and Sewardstone in Essex; Borehamwood, Bushey, Carpenders Park, Elstree and South Oxhey in Hertfordshire; and Ewell, Molesey, Thames Ditton and Whyteleafe in Surrey.
Telephone numbers in the town have the London (020) area code.

Tristan da Cunha

TristanTristan da Cunha group [map]
The 020 dialling code is also used by the Foreign and Commonwealth Office Telecommunications Network, provided by Global Crossing, and is one of two dialling codes for the remote South Atlantic island of Tristan da Cunha.

UK telephone code misconceptions

common misconceptionerroneous UK telephone codesmisquoted
As a result of this history, there is now a widespread misconception that 0207 and 0208 are the dialling codes for parts of London.
Although call charges between the adjacent areas remained at a local rate, some may have believed charges within the city increased as a result.

Telephone numbers in the United Kingdom

+44dialling code0141
020 is the national dialling code for London in the United Kingdom.
The code allocated to the largest population is (020) for London.

Ewell

Ewell High StreetWest Ewell
Communities outside Greater London that are within the code are Buckhurst Hill, Chigwell, Loughton and Sewardstone in Essex; Borehamwood, Bushey, Carpenders Park, Elstree and South Oxhey in Hertfordshire; and Ewell, Molesey, Thames Ditton and Whyteleafe in Surrey.
Unlike most parts of its borough, Ewell has telephone numbers using the London 020 area code.

London Borough of Bexley

BexleyBexley CouncilLB Bexley
The six boroughs that have significant areas within other codes are Bexley, partly within the Dartford (01322) code; Bromley, partly within the Orpington (01689) and Westerham (01959) codes; Croydon, partly within the Orpington (01689) and Redhill (01737) codes; Enfield, partly within the Waltham Cross (01992) code; Havering, mostly within the Romford (01708) code; and Hillingdon, partly within the Uxbridge (01895), Slough (01753) and Watford (01923) codes.

London Borough of Enfield

EnfieldEnfield London Borough CouncilEnfield, London
The six boroughs that have significant areas within other codes are Bexley, partly within the Dartford (01322) code; Bromley, partly within the Orpington (01689) and Westerham (01959) codes; Croydon, partly within the Orpington (01689) and Redhill (01737) codes; Enfield, partly within the Waltham Cross (01992) code; Havering, mostly within the Romford (01708) code; and Hillingdon, partly within the Uxbridge (01895), Slough (01753) and Watford (01923) codes.

London Borough of Havering

HaveringLB HaveringBorough of Havering
The six boroughs that have significant areas within other codes are Bexley, partly within the Dartford (01322) code; Bromley, partly within the Orpington (01689) and Westerham (01959) codes; Croydon, partly within the Orpington (01689) and Redhill (01737) codes; Enfield, partly within the Waltham Cross (01992) code; Havering, mostly within the Romford (01708) code; and Hillingdon, partly within the Uxbridge (01895), Slough (01753) and Watford (01923) codes.

Greater London

LondonLondon regionGreater
The area it serves, which includes most of Greater London and some adjacent areas, was first allocated the STD code 01 in 1959.

Trunk prefix

trunk code8city or region
In common with all other British area codes the initial '0' is a trunk prefix that is not required when dialling London from abroad.

Foreign and Commonwealth Office

Foreign OfficeBritish Foreign OfficeFCO
The 020 dialling code is also used by the Foreign and Commonwealth Office Telecommunications Network, provided by Global Crossing, and is one of two dialling codes for the remote South Atlantic island of Tristan da Cunha.

Global Crossing

Global Crossing EuropeGlobal Crossing Europe Ltd.Global Crossing Ltd.
The 020 dialling code is also used by the Foreign and Commonwealth Office Telecommunications Network, provided by Global Crossing, and is one of two dialling codes for the remote South Atlantic island of Tristan da Cunha.

City of London

CityLondonthe City
The first exchange in this area, Central, was opened in the City of London on 1 March 1902.

Director telephone system

Directordirector exchangeDirector system
The Director telephone system was developed so that subscribers in London could call one another in a linked numbering scheme regardless of whether they were on a manual local exchange or an automatic one.

Oxford Street

New Oxford StreetOxford309 Oxford Street
By 1934, the London telephone area comprised all 147 exchanges within 12.5 mi of Oxford Circus.

Heathrow Airport

HeathrowLondon HeathrowLondon Heathrow International Airport
In 1958, a new exchange was opened at London Heathrow Airport.

Mnemonic

mnemonicsmnemonic devicememory system
From 1922, the first three digits of a seven-digit subscriber number – in other words, the local exchange codes – were represented with letters by way of a mnemonic.

Overlay plan

overlayoverlaidoverlay area code
More than one local exchange code was usually overlaid for each area, so all Wimbledon numbers did not necessarily begin "946".

Subscriber trunk dialling

STDSTD code487
The area it serves, which includes most of Greater London and some adjacent areas, was first allocated the STD code 01 in 1959.

London Docklands

DocklandsLondon docksLondon's Docklands
Exceptionally, two exchanges in the East sector covering the London Docklands redevelopment area were assigned the 071 code.