Skip to main content
WhoCalledLookup
Look up a number

Geographic

0203 London (020 3) numbers UK

0203 is not a separate area code — it is London's 020 code followed by local numbers beginning 3, released in 2005 when the original 020 7 and 020 8 stock ran low. Calls cost the same as any UK landline.

Ofcom lists 921 allocated 0203 ranges, the most held by BT. Cost to call: standard landline rate, usually inside call bundles. Visitors have checked 1,259 different 0203 numbers here.

0203 at a glance

Number type
Geographic
Allocated ranges
921 of 1,000 on Ofcom's register
Largest holders
First allocated
7 June 2005
Newest range
10 August 2026 (7 in the last 12 months)

Source: Ofcom numbering data, re-imported weekly.

What it costs to call a 0203 number

Standard landline rate, usually inside call bundles.

From a landline
Typically up to 16p a minute, often with a 23p set-up fee, or included in a call package
From a mobile
Normally in inclusive minutes; 3p to 65p a minute outside them

Source: Ofcom call costs guide (updated 31 January 2025). Ofcom treats these as indicative; your provider sets the final price.

What people check and report about 0203 numbers

From searches in our lookup form since 13 May 2026 and the verdicts and reports visitors left. A check means someone typed the number in, usually after a missed call.

Checks
1,433
Different numbers checked
1,259
Different people checking
1,317

By day of the week

Busiest: Tuesday (22% of checks)

MoTuWeThFrSaSu

By hour (UK time)

Busiest: 12pm–1pm; the three busiest hours hold 33% of checks

0:006:0012:0018:0023:00

Caller verdicts on 0203 numbers: 37

Scam 84% (31) · Nuisance 8% (3) · Safe 8% (3)

Community reports: bank impersonation (2), parcel and courier scams (1).

Latest comments

  • “Claimed to be from Aqua Bank”

    Scam · 020 3896 5846 · 5 Nov 2026

  • “called saying my sim card would be blocked”

    Scam · 020 3697 3280 · 2 Nov 2026

  • “This is clearly fraud!!!. I haven't used WhatsApp for over 12 years. Use Signal! It’s non-commercial and super secure. Meta collects everything from text to photos/videos and voice profiles—why would you want that? My advice: start using Signal alongside WhatsApp, and you’ll be”

    Scam · 020 3856 4522 · 27 Oct 2026

Recent community reports on 0203 numbers

Most-reported and most-checked 0203 numbers

NumberVerdictsReportsPeople checking
020 3089 21392 scam—3
020 3566 10672 scam—2
020 3896 94561 scam11
020 3340 65601 safe—3
020 3345 76871 scam—3

If a 0203 number called you

Reports here are mostly about bank impersonation and parcel and courier scams, so treat unexpected calls as possible scams.

  1. 1

    Bank calls: use 159

    Hang up and dial 159 from a phone the caller hasn't just used. It connects you to most UK banks' real fraud lines. Your bank will never ask you to move money to a 'safe account'.

    159 (Stop Scams UK) ↗

  2. 2

    Call back on a number you trust

    If a caller says they're your bank, HMRC, a courier or a council, hang up and ring the organisation on the number from its website or your statement, never the number that called you. Caller ID can be faked.

  3. 3

    Forward it to 7726

    On a mobile, copy the caller's number from your recent calls and text it to 7726 (it spells SPAM). Scam texts can be forwarded to 7726 as they are. It's free, and your network uses the reports to investigate and block numbers.

    Ofcom: what to do about a scam call ↗

  4. 4

    If you lost money or shared details

    Call your bank on the number on your card (or 159 to reach most UK banks safely), then report it to Report Fraud online or on 0300 123 2040. Report Fraud replaced Action Fraud on 4 December 2025 for England, Wales and Northern Ireland; in Scotland call Police Scotland on 101.

    159 (Stop Scams UK) ↗Report Fraud ↗

About 0203 numbers in the UK

0203 belongs to the Geographic family of Ofcom’s National Telephone Numbering Plan. 0203 is not a separate area code — it is London's 020 code followed by local numbers beginning 3, released in 2005 when the original 020 7 and 020 8 stock ran low. Calls cost the same as any UK landline. Ofcom allocates 0203 ranges to communications providers, who assign them to the organisations that use them; the table below lists the ranges in the latest weekly Ofcom data. For how prefixes are organised, see how Ofcom allocates UK phone numbers.

Ranges starting with 0203first 200 of 1,000
PrefixStatusRange holderAllocated
+44 203000AllocatedDigital Mail Limited7 June 2005
+44 203001AllocatedSyntec Limited30 June 2005
+44 203002AllocatedGamma Telecom Holdings Limited28 June 2005
+44 203003AllocatedColt Technology Services20 June 2005
+44 203004AllocatedGamma Telecom Holdings Limited28 June 2005
+44 203005AllocatedGamma Telecom Holdings Limited28 June 2005
+44 203006AllocatedGamma Telecom Holdings Limited28 June 2005
+44 203007AllocatedBT26 July 2005
+44 203008AllocatedVerizon UK Limited28 June 2005
+44 203009AllocatedVerizon UK Limited11 October 2005
+44 203010AllocatedBT17 June 2005
+44 203011AllocatedVoiceHost Limited22 June 2010
+44 203012AllocatedInvade International Ltd12 January 2016
+44 203013Protected——
+44 203014AllocatedLumen Technologies UK Limited9 January 2006
+44 203015AllocatedSky UK Limited5 June 2013
+44 203016AllocatedSky UK Limited5 June 2013
+44 203017AllocatedSix Degrees Technology Group Limited8 April 2020
+44 203018AllocatedBarritel Limited13 February 2006
+44 203019AllocatedFuse 2 Communications Ltd22 January 2024
+44 203020AllocatedGCI Network Solutions Limited25 April 2017
+44 203021AllocatedDigital Space Group Limited12 April 2016
+44 203022AllocatedBT17 June 2005
+44 203023AllocatedColt Technology Services20 June 2005
+44 203024AllocatedBT2 February 2006
+44 203025AllocatedGamma Telecom Holdings Limited18 May 2023
+44 203026AllocatedSimwood eSMS Limited18 July 2006
+44 203027AllocatedBT2 February 2006
+44 203028AllocatedVirgin Media Limited25 February 2014
+44 203029Protected——
+44 203030AllocatedServed Up Limited3 June 2008
+44 203031AllocatedGamma Telecom Holdings Limited28 June 2005
+44 203032Protected——
+44 203033AllocatedBT17 June 2005
+44 203034AllocatedOrbtalk Limited8 December 2014
+44 203035Protected——
+44 203036AllocatedColt Technology Services20 June 2005
+44 203037AllocatedColt Technology Services23 February 2006
+44 203038AllocatedColt Technology Services23 February 2006
+44 203039AllocatedVoiceHost Limited22 June 2010
+44 203040AllocatedRedcentric Solutions Limited5 June 2015
+44 203041Allocated4D Interactive Ltd17 January 2007
+44 203042AllocatedVirgin Media Limited2 June 2006
+44 203043AllocatedVerizon UK Limited28 June 2005
+44 203044AllocatedBT17 June 2005
+44 203045AllocatedVirgin Media Limited9 June 2006
+44 203046AllocatedRingGo Limited14 June 2006
+44 203047AllocatedColt Technology Services4 September 2006
+44 203048AllocatedColt Technology Services4 September 2006
+44 203049AllocatedColt Technology Services4 September 2006
+44 203050Protected——
+44 203051AllocatedMagrathea Telecommunications Limited26 January 2007
+44 203052Protected——
+44 203053AllocatedGamma Telecom Holdings Limited29 May 2013
+44 203054AllocatedCINOS LIMITED24 March 2022
+44 203055AllocatedBT17 June 2005
+44 203056AllocatedSix Degrees Technology Group Limited8 April 2020
+44 203057AllocatedVerizon UK Limited1 September 2006
+44 203058AllocatedDigital Space Group Limited7 February 2006
+44 203059AllocatedColt Technology Services2 January 2007
+44 203060AllocatedVerizon UK Limited28 June 2005
+44 203061Protected——
+44 203062AllocatedBT11 December 2006
+44 203063AllocatedVodafone Ltd (C&W)1 April 2019
+44 203064AllocatedVoicetec Systems Ltd22 June 2006
+44 203065AllocatedNextec UK Limited6 December 2013
+44 203066AllocatedBT17 June 2005
+44 203067AllocatedBT1 August 2005
+44 203068AllocatedBT1 August 2005
+44 203069AllocatedBT1 August 2005
+44 203070AllocatedVodafone Ltd (C&W)1 October 2013
+44 203071AllocatedBT1 August 2005
+44 203072AllocatedBT1 August 2005
+44 203073AllocatedBT1 August 2005
+44 203074AllocatedBT1 August 2005
+44 203075AllocatedBT1 August 2005
+44 203076AllocatedBT1 August 2005
+44 203077AllocatedBT17 June 2005
+44 203078AllocatedBT1 August 2005
+44 203079Protected——
+44 203080AllocatedBT17 June 2005
+44 203081AllocatedAtlas Interactive Group Limited28 October 2005
+44 203082AllocatedVodafone Ltd (C&W)1 October 2013
+44 203083Protected——
+44 203084AllocatedBT11 December 2006
+44 203085Protected——
+44 203086AllocatedVodafone Ltd (C&W)1 October 2013
+44 203087Protected——
+44 203088AllocatedColt Technology Services17 February 2020
+44 203089AllocatedBT11 December 2006
+44 203090Protected——
+44 203091AllocatedSky UK Limited5 June 2013
+44 203092AllocatedTalkTalk Communications Limited16 July 2013
+44 203093AllocatedBT19 July 2013
+44 203094AllocatedSquare Systems Limited6 September 2006
+44 203095AllocatedAndrews & Arnold Ltd13 October 2006
+44 203096AllocatedVoiceflex Limited19 July 2013
+44 203097AllocatedWAVECREST NETWORKS LIMITED16 December 2019
+44 203098AllocatedGamma Telecom Holdings Limited28 January 2016
+44 203099Protected——
+44 203100AllocatedColt Technology Services20 June 2005
+44 203101AllocatedAlphatalk Limited31 January 2014
+44 203102AllocatedGTT-EMEA LTD14 October 2021
+44 203103AllocatedColt Technology Services20 June 2005
+44 203104AllocatedAlphatalk Limited31 January 2014
+44 203105AllocatedTalkTalk Communications Limited6 January 2015
+44 203106AllocatedAlphatalk Limited31 January 2014
+44 203107AllocatedVerizon UK Limited28 June 2005
+44 203108AllocatedVirgin Media Limited18 March 2016
+44 203109AllocatedCommi Holdings Limited21 November 2016
+44 203110AllocatedBT16 June 2005
+44 203111AllocatedServed Up Limited3 June 2008
+44 203112AllocatedBT17 June 2005
+44 203113AllocatedBT17 June 2005
+44 203114AllocatedBT17 June 2005
+44 203115AllocatedBT17 June 2005
+44 203116AllocatedBT17 June 2005
+44 203117AllocatedBT17 June 2005
+44 203118AllocatedBT17 June 2005
+44 203119AllocatedBT17 June 2005
+44 203120Protected——
+44 203121AllocatedBT17 June 2005
+44 203122AllocatedBT17 June 2005
+44 203123AllocatedVodafone Ltd (C&W)11 September 2013
+44 203124AllocatedVodafone Ltd (C&W)11 September 2013
+44 203125Protected——
+44 203126AllocatedVodafone Ltd (C&W)11 September 2013
+44 203127AllocatedLycatel (Ireland) Limited1 March 2006
+44 203128AllocatedVodafone Ltd (C&W)11 September 2013
+44 203129AllocatedLocalphone Limited22 May 2007
+44 203130AllocatedGCI Network Solutions Limited22 December 2023
+44 203131AllocatedGCI Network Solutions Limited22 December 2023
+44 203132AllocatedVodafone Ltd (C&W)11 September 2013
+44 203133AllocatedBT17 June 2005
+44 203134AllocatedColt Technology Services1 March 2006
+44 203135AllocatedCitrus Telecommunications Ltd9 August 2005
+44 203136AllocatedVirgin Media Limited18 March 2016
+44 203137AllocatedAQL Wholesale Ltd6 July 2006
+44 203138AllocatedVodafone Ltd (C&W)11 September 2013
+44 203139AllocatedVerizon UK Limited28 June 2005
+44 203140AllocatedColt Technology Services7 September 2005
+44 203141AllocatedSpitfire Network Services Limited1 July 2005
+44 203142AllocatedSix Degrees Technology Group Limited8 April 2020
+44 203143AllocatedINTELLIGENT EXCHANGES LIMITED26 January 2026
+44 203144AllocatedBT17 June 2005
+44 203145AllocatedSix Degrees Technology Group Limited8 April 2020
+44 203146AllocatedVoiceflex Limited19 November 2015
+44 203147AllocatedVerizon UK Limited1 September 2006
+44 203148AllocatedGamma Telecom Holdings Limited17 November 2017
+44 203149AllocatedBT19 April 2007
+44 203150AllocatedNationwide Telephone Assistance Ltd2 September 2005
+44 203151AllocatedTTNC Limited15 November 2013
+44 203152AllocatedVodafone Ltd (C&W)15 November 2021
+44 203153AllocatedInTouch Communication Services Limited13 February 2006
+44 203154AllocatedBT19 April 2007
+44 203155AllocatedBT17 June 2005
+44 203156Protected——
+44 203157AllocatedBT18 January 2007
+44 203158AllocatedVodafone Ltd (C&W)15 November 2021
+44 203159AllocatedVerizon UK Limited28 June 2005
+44 203160AllocatedVerizon UK Limited28 June 2005
+44 203161AllocatedBT10 November 2021
+44 203162AllocatedResilient Limited31 May 2006
+44 203163AllocatedVodafone Ltd (C&W)15 November 2021
+44 203164Protected——
+44 203165AllocatedBT24 August 2006
+44 203166AllocatedBT17 June 2005
+44 203167AllocatedSix Degrees Technology Group Limited8 April 2020
+44 203168AllocatedCitrus Telecommunications Ltd1 September 2016
+44 203169Allocated24 Seven Cloud Communications Ltd13 September 2019
+44 203170AllocatedVerizon UK Limited5 April 2006
+44 203171Protected——
+44 203172AllocatedSky UK Limited16 October 2013
+44 203173AllocatedJtec UK Limited26 July 2011
+44 203174AllocatedBT18 January 2007
+44 203175Protected——
+44 203176AllocatedThe Excell Group Limited28 September 2006
+44 203177AllocatedBT17 June 2005
+44 203178AllocatedVerizon UK Limited23 April 2007
+44 203179AllocatedLondon Central Communications Ltd11 December 2006
+44 203180AllocatedVerizon UK Limited5 April 2006
+44 203181AllocatedBT17 June 2005
+44 203182AllocatedBT1 August 2005
+44 203183AllocatedBT1 August 2005
+44 203184AllocatedBT1 August 2005
+44 203185AllocatedBT1 August 2005
+44 203186AllocatedBT1 August 2005
+44 203187AllocatedBT1 August 2005
+44 203188AllocatedBT1 August 2005
+44 203189AllocatedSix Degrees Technology Group Limited8 April 2020
+44 203190AllocatedTGL Services (UK) Ltd2 February 2015
+44 203191AllocatedSwiftnet Limited12 November 2008
+44 203192AllocatedColt Technology Services24 May 2007
+44 203193AllocatedVodafone Ltd (C&W)11 September 2013
+44 203194AllocatedVerizon UK Limited9 March 2007
+44 203195AllocatedFuse 2 Communications Ltd22 January 2024
+44 203196AllocatedBT20 March 2007
+44 203197AllocatedBT20 March 2007
+44 203198AllocatedBT26 January 2015
+44 203199AllocatedCalltracks Limited20 September 2013

Related lookups

FAQs about 0203

What does 0203 cost to call?

Standard landline rate, usually inside call bundles. From a landline: Typically up to 16p a minute, often with a 23p set-up fee, or included in a call package. From a mobile: Normally in inclusive minutes; 3p to 65p a minute outside them. (Ofcom call costs guide.)

Who provides 0203 numbers?

Ofcom lists 921 allocated 0203 ranges. The largest holders are BT (230), Gamma Telecom Holdings Limited (138) and Colt Technology Services (77). The holder is the company that supplies the number to the organisation using it, not the caller.

Do people report 0203 calls?

Visitors have checked 1,259 different 0203 numbers here since May 2026. 37 verdicts so far: 31 scam, 3 nuisance, 3 safe.

How do I report a 0203 call?

On a mobile, text the number to 7726 (free). Report fraud to Report Fraud on 0300 123 2040 (Police Scotland on 101 in Scotland); unwanted sales calls go to the ICO once you've registered with the Telephone Preference Service.