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Geographic

0204 London (020 4) numbers UK

0204 numbers are London 020 numbers whose local digits begin 4 — the newest London range, released by Ofcom in October 2019. An 0204 caller is dialling from a real or virtual London line at standard landline rates.

Ofcom lists 155 allocated 0204 ranges, the most held by Colt Technology Services. Cost to call: standard landline rate, usually inside call bundles. Visitors have checked 776 different 0204 numbers here.

0204 at a glance

Number type
Geographic
Allocated ranges
155 of 200 on Ofcom's register
Largest holders
First allocated
7 October 2019
Newest range
19 October 2026 (14 in the last 12 months)

Source: Ofcom numbering data, re-imported weekly.

What it costs to call a 0204 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 0204 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
927
Different numbers checked
776
Different people checking
848

By day of the week

Busiest: Tuesday (24% of checks)

MoTuWeThFrSaSu

By hour (UK time)

Busiest: 3pm–4pm; the three busiest hours hold 35% of checks

0:006:0012:0018:0023:00

Caller verdicts on 0204 numbers: 20

Scam 65% (13) · Nuisance 20% (4) · Safe 15% (3)

Latest comments

  • “It was a general recruitment agency”

    Safe · 020 4615 6111 · 10 Nov 2026

  • “Claimed to be my banks fraud team”

    Scam · 020 4542 3319 · 14 Oct 2026

  • “Claimed to be a financial fraud team”

    Scam · 020 4638 3413 · 18 Aug 2026

Most-reported and most-checked 0204 numbers

NumberVerdictsReportsPeople checking
020 4613 71992 scam—8
020 4601 97951 nuisance—4
020 4600 19721 scam—3
020 4624 16011 nuisance—3
020 4520 84451 scam—2

If a 0204 number called you

Most verdicts on these numbers say scam, so treat unexpected calls as possible scams.

  1. 1

    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.

  2. 2

    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 ↗

  3. 3

    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 0204 numbers in the UK

0204 belongs to the Geographic family of Ofcom’s National Telephone Numbering Plan. 0204 numbers are London 020 numbers whose local digits begin 4 — the newest London range, released by Ofcom in October 2019. An 0204 caller is dialling from a real or virtual London line at standard landline rates. Ofcom allocates 0204 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 0204200 on Ofcom's register
PrefixStatusRange holderAllocated
+44 204500AllocatedSyntec Limited18 October 2019
+44 204501AllocatedTalkTalk Communications Limited9 January 2020
+44 204502AllocatedMagrathea Telecommunications Limited12 November 2019
+44 204503AllocatedHyperoptic Ltd7 January 2020
+44 204504AllocatedDRD Communications Limited5 October 2023
+44 204505AllocatedBT7 January 2020
+44 204506AllocatedBT7 January 2020
+44 204507AllocatedVerizon UK Limited6 February 2020
+44 204508AllocatedOdigo16 March 2020
+44 204509AllocatedGamma Telecom Holdings Limited24 March 2020
+44 204510AllocatedColt Technology Services25 February 2020
+44 204511AllocatedGamma Telecom Holdings Limited27 May 2020
+44 204512AllocatedBT9 April 2020
+44 204513AllocatedGamma Telecom Holdings Limited25 February 2020
+44 204514AllocatedColt Technology Services30 March 2020
+44 204515AllocatedColt Technology Services25 February 2020
+44 204516AllocatedBT9 April 2020
+44 204517AllocatedBT9 April 2020
+44 204518AllocatedColt Technology Services19 May 2020
+44 204519AllocatedColt Technology Services27 May 2020
+44 204520AllocatedTELNYX UK LIMITED28 April 2020
+44 204521AllocatedColt Technology Services27 May 2020
+44 204522AllocatedColt Technology Services27 May 2020
+44 204523AllocatedColt Technology Services1 July 2020
+44 204524AllocatedGamma Telecom Holdings Limited19 August 2020
+44 204525AllocatedVoxbone SA24 April 2020
+44 204526AllocatedColt Technology Services1 July 2020
+44 204527AllocatedMedia Hawk Ltd28 July 2020
+44 204528AllocatedColt Technology Services24 August 2020
+44 204529AllocatedBT24 August 2020
+44 204530AllocatedGamma Telecom Holdings Limited16 September 2020
+44 204531AllocatedBT13 October 2020
+44 204532AllocatedColt Technology Services8 October 2020
+44 204533AllocatedGCI Network Solutions Limited22 December 2023
+44 204534AllocatedColt Technology Services30 September 2020
+44 204535AllocatedEG TECHNOLOGIES LIMITED21 January 2020
+44 204536AllocatedColt Technology Services30 September 2020
+44 204537AllocatedBT13 October 2020
+44 204538AllocatedTwilio Ireland Limited15 September 2020
+44 204539AllocatedBT13 October 2020
+44 204540AllocatedColt Technology Services14 October 2019
+44 204541AllocatedBT7 December 2020
+44 204542AllocatedGamma Telecom Holdings Limited10 November 2020
+44 204543Allocated9EONS LIMITED16 December 2020
+44 204544AllocatedPlanet Telecom Ltd8 October 2019
+44 204545AllocatedAQL Wholesale Ltd8 October 2019
+44 204546AllocatedSpitfire Network Services Limited9 December 2019
+44 204547AllocatedHyperoptic Ltd30 December 2020
+44 204548AllocatedGamma Telecom Holdings Limited8 January 2021
+44 204549AllocatedGamma Telecom Holdings Limited12 January 2021
+44 204550AllocatedGlobal Reach Networks Limited7 October 2019
+44 204551AllocatedColt Technology Services12 January 2021
+44 204552AllocatedColt Technology Services3 December 2020
+44 204553AllocatedVoiceflex Limited22 January 2021
+44 204554AllocatedNode4 Ltd26 November 2019
+44 204555AllocatedCore Telecom Limited21 October 2019
+44 204556AllocatedCINOS LIMITED3 February 2021
+44 204557AllocatedOrange Business Holdings UK Limited6 May 2021
+44 204558AllocatedColt Technology Services23 March 2021
+44 204559AllocatedBT8 March 2021
+44 204560AllocatedColt Technology Services6 November 2020
+44 204561AllocatedColt Technology Services6 November 2020
+44 204562AllocatedColt Technology Services6 November 2020
+44 204563AllocatedColt Technology Services6 November 2020
+44 204564AllocatedColt Technology Services6 November 2020
+44 204565AllocatedColt Technology Services6 November 2020
+44 204566AllocatedColt Technology Services6 November 2020
+44 204567AllocatedWindsor Telecom Limited14 October 2019
+44 204568AllocatedBT8 March 2021
+44 204569AllocatedBuzz Networks Limited11 May 2021
+44 204570AllocatedColt Technology Services5 July 2021
+44 204571AllocatedVoxbone SA16 September 2021
+44 204572AllocatedTwilio Ireland Limited13 October 2021
+44 204573AllocatedComms Solutions Limited18 January 2022
+44 204574AllocatedColt Technology Services12 August 2021
+44 204575AllocatedJAINTEL LIMITED28 July 2021
+44 204576AllocatedColt Technology Services12 August 2021
+44 204577AllocatedSMARTVOICE LTD1 June 2020
+44 204578AllocatedBelgacom International Carrier Services SA20 August 2021
+44 204579AllocatedVoxbone SA17 January 2022
+44 204580AllocatedSiPalto Ltd5 November 2019
+44 204581AllocatedGamma Telecom Holdings Limited30 June 2022
+44 204582AllocatedColt Technology Services17 February 2022
+44 204583AllocatedColt Technology Services8 August 2022
+44 204584AllocatedMagrathea Telecommunications Limited10 November 2021
+44 204585AllocatedFuse 2 Communications Ltd6 May 2021
+44 204586AllocatedVoxbone SA18 July 2022
+44 204587AllocatedVoxbone SA18 July 2022
+44 204588AllocatedNuso Cloud UK Limited10 October 2019
+44 204589AllocatedGamma Telecom Holdings Limited27 October 2022
+44 204590AllocatedTelet Research (NI) Limited1 November 2021
+44 204591AllocatedColt Technology Services6 June 2023
+44 204592AllocatedColt Technology Services20 April 2023
+44 204593Quarantined——
+44 204594AllocatedBT31 January 2022
+44 204595Allocated24 Seven Communications Limited13 July 2021
+44 204596AllocatedSONA BUSINESS PVT. LTD.27 March 2023
+44 204597AllocatedHyperoptic Ltd20 July 2023
+44 204598AllocatedKCOM Group Ltd8 September 2022
+44 204599AllocatedNebula Cloud Limited27 April 2021
+44 204600AllocatedVoxbone SA3 April 2024
+44 204601AllocatedTata Communications (UK) Limited10 November 2023
+44 204602AllocatedColt Technology Services6 February 2024
+44 204603AllocatedGamma Telecom Holdings Limited6 February 2024
+44 204604AllocatedColt Technology Services4 March 2024
+44 204605AllocatedGamma Telecom Holdings Limited3 November 2023
+44 204606AllocatedGamma Telecom Holdings Limited21 March 2024
+44 204607AllocatedGamma Telecom Holdings Limited21 March 2024
+44 204608AllocatedGamma Telecom Holdings Limited21 March 2024
+44 204609AllocatedGamma Telecom Holdings Limited21 March 2024
+44 204610AllocatedPebbletree Ltd5 April 2024
+44 204611AllocatedDirect Market Solutions Ltd3 April 2024
+44 204612AllocatedGamma Telecom Holdings Limited21 March 2024
+44 204613AllocatedBT30 April 2024
+44 204614AllocatedColt Technology Services13 June 2024
+44 204615AllocatedGamma Telecom Holdings Limited14 June 2024
+44 204616AllocatedNFON UK Ltd30 May 2024
+44 204617AllocatedGamma Telecom Holdings Limited16 September 2024
+44 204618AllocatedBT25 June 2024
+44 204619AllocatedBT25 June 2024
+44 204620AllocatedTELNYX UK LIMITED23 July 2024
+44 204621AllocatedColt Technology Services16 January 2025
+44 204622AllocatedINTELLIGENT EXCHANGES LIMITED26 January 2026
+44 204623AllocatedColt Technology Services16 January 2025
+44 204624AllocatedM3st Limited12 November 2024
+44 204625AllocatedBT30 January 2025
+44 204626AllocatedGamma Telecom Holdings Limited10 February 2025
+44 204627AllocatedGamma Telecom Holdings Limited19 October 2026
+44 204628AllocatedGamma Telecom Holdings Limited26 March 2025
+44 204629AllocatedBT10 April 2025
+44 204630AllocatedGamma Telecom Holdings Limited6 May 2025
+44 204631AllocatedBT28 April 2025
+44 204632AllocatedGamma Telecom Holdings Limited2 June 2025
+44 204633AllocatedIOVOX Limited2 June 2025
+44 204634AllocatedTwilio Ireland Limited14 July 2025
+44 204635AllocatedBT1 August 2025
+44 204636AllocatedBT19 June 2025
+44 204637AllocatedHyperoptic Ltd22 September 2025
+44 204638AllocatedVoxbone SA26 September 2025
+44 204639AllocatedBT9 October 2025
+44 204640AllocatedGamma Telecom Holdings Limited16 October 2025
+44 204641AllocatedBT31 October 2025
+44 204642AllocatedBT31 October 2025
+44 204643AllocatedAI Comms Ltd19 January 2026
+44 204644AllocatedColt Technology Services2 December 2025
+44 204645AllocatedIOVOX Limited17 November 2025
+44 204646AllocatedGamma Telecom Holdings Limited4 July 2025
+44 204647AllocatedBT24 November 2025
+44 204648AllocatedVerizon UK Limited15 December 2025
+44 204649AllocatedVerizon UK Limited15 December 2025
+44 204650AllocatedVoiceflex Limited11 February 2026
+44 204651AllocatedGamma Telecom Holdings Limited20 January 2026
+44 204652AllocatedTwilio Ireland Limited6 March 2026
+44 204653AllocatedColt Technology Services10 August 2026
+44 204654AllocatedVoxbone SA16 February 2026
+44 204655Free——
+44 204656Free——
+44 204657AllocatedInet Telecoms Ltd (Voipfone)1 October 2026
+44 204658Free——
+44 204659Free——
+44 204660Protected——
+44 204661Protected——
+44 204662Protected——
+44 204663Protected——
+44 204664Protected——
+44 204665Protected——
+44 204666Protected——
+44 204667Protected——
+44 204668Protected——
+44 204669Protected——
+44 204670Protected——
+44 204671Protected——
+44 204672Protected——
+44 204673Protected——
+44 204674Protected——
+44 204675Protected——
+44 204676Protected——
+44 204677Protected——
+44 204678Protected——
+44 204679Protected——
+44 204680Protected——
+44 204681Protected——
+44 204682Protected——
+44 204683Protected——
+44 204684Protected——
+44 204685Protected——
+44 204686Protected——
+44 204687Protected——
+44 204688Protected——
+44 204689Protected——
+44 204690Protected——
+44 204691Protected——
+44 204692Protected——
+44 204693Protected——
+44 204694Protected——
+44 204695Protected——
+44 204696Protected——
+44 204697Protected——
+44 204698Protected——
+44 204699Protected——

Related lookups

FAQs about 0204

What does 0204 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 0204 numbers?

Ofcom lists 155 allocated 0204 ranges. The largest holders are Colt Technology Services (38), Gamma Telecom Holdings Limited (27) and BT (25). The holder is the company that supplies the number to the organisation using it, not the caller.

Do people report 0204 calls?

Visitors have checked 776 different 0204 numbers here since May 2026. 20 verdicts so far: 13 scam, 4 nuisance, 3 safe.

How do I report a 0204 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.