Is This London Number a Scam? Real (020) Scams Explained and How to Check

London number scam 020 calls are now one of the most reported nuisance patterns in the UK. Most 020 numbers belong to real London businesses, GPs and households, but criminals spoof the code because callers are more likely to answer a familiar capital-city CLI. This guide covers six 020 scam scripts active in 2026, the Ofcom-reserved “drama” block to watch for, and a four-step way to verify any London number in under a minute.

Why scammers prefer 020 London numbers

020 is the geographic area code for Greater London and the most trusted dialling code in the country. To a person glancing at their handset, an incoming 020 7… or 020 3… call signals a bank, an HMRC office, a Harley Street GP or a Square Mile employer. That perception is the entire reason fraudsters target it.

Three structural factors make 020 unusually easy to spoof. First, international VoIP termination can present any Calling Line Identification (CLI), and although Ofcom’s CLI authentication rules require UK networks to block obviously invalid CLIs, criminals routinely choose ranges that look legitimately allocated. Second, 020 has more than 80 million available numbers split across 0203, 0207 and 0208 prefixes, so it is simple to pick an unallocated-looking number that still parses as London. Third, London hosts the highest concentration of UK financial decisions, so every minute a Square Mile finance director takes a spoofed call is a minute that can be monetised.

If you want to triage a specific 020 caller right now, our free lookup at /who-called-me/020/ shows the Ofcom-allocated block, the original Communications Provider (CP), and any reports filed by other UK users in the last 90 days.

The 6 most common 020 scams in 2026

Action Fraud and the National Cyber Security Centre consistently report the same handful of 020 scam patterns each quarter. The opening scripts evolve, but the underlying social-engineering goal is identical: gain access to money, credentials or your computer. The six patterns below cover the vast majority of London-CLI scam reports we see today.

1. HMRC tax-debt and “arrest warrant” scam

Typical CLI: spoofed 0203 or 0207 numbers resembling a real HMRC switchboard. The recorded opening claims “due to HMRC fraud activity in your name, a warrant has been issued” and instructs you to press 1 to speak to an officer. The goal is to extract payment in vouchers, cryptocurrency or via a fake “bail” bank transfer. HMRC never threatens arrest by phone; forward suspicious calls to [email protected] and Action Fraud.

2. NHS or GP impersonation

Typical CLI: a 0207 number close to a real London teaching hospital range, or a generic 0203 number presented as “the GP’s secretary”. The caller claims to be confirming an appointment, a prescription change or an urgent test result and asks you to “verify your identity” with full name, date of birth, address and the last four digits of your debit card. NHS staff will not ask for card details over the phone.

3. Royal Mail or courier “missed parcel” callback

This usually begins as an SMS, but the callback is the dangerous half. A text claims a parcel could not be delivered because of a small unpaid fee and includes a London 020 number to ring. The line is staffed by fluent operators who collect card details “to release the parcel” and enrol your card into Apple Pay or Google Pay on their device. Genuine couriers never charge customs through a callback.

4. Bank fraud-team impersonation (APP fraud)

Typical CLI: spoofed 0207 numbers matching the publicly listed switchboards of Lloyds, Barclays, Santander, NatWest, HSBC or Monzo. The caller claims fraud has been detected and instructs you to “move your money to a safe account” they have just opened in your name. This is Authorised Push Payment (APP) fraud and the single largest category of UK consumer financial loss. Under the 2024 Payment Systems Regulator reimbursement rules your bank must refund eligible APP-fraud victims, but stopping the transfer is always preferable.

5. “City of London” investment cold call

Typical CLI: prestige-sounding 0207 numbers in real Mayfair, City or Canary Wharf ranges. The script offers exclusive access to a pre-IPO share, a “green energy bond”, a crypto fund or carbon credits, with high-pressure deadlines. Unsolicited cold calls about investments are themselves an offence under the Financial Services and Markets Act. Check any firm on the FCA’s Financial Services Register first.

6. Microsoft or Apple “tech-support” scam

Typical CLI: any 020 number, sometimes selected from a leaked corporate directory of London IT staff. The caller claims your Microsoft 365, Apple ID or Norton subscription has been compromised, then walks you through installing remote-access software such as AnyDesk or TeamViewer. Once installed, the criminal logs into online banking on your behalf. For SMEs this can escalate into ransomware deployment; our companion guide on vishing attacks on UK SMEs goes deeper on the business-side variant.

The Ofcom “reserved-for-drama” 020 7946 range

Here is a detail very few people know. Under Schedule 1 of Ofcom’s National Telephone Numbering Plan, the entire 10,000-number block 020 7946 0000 to 020 7946 9999 is reserved by Ofcom for fictional use in television, film, theatre, training videos and books. No real subscriber can be allocated a number in this range. It is the UK equivalent of the American “555-0100” convention.

This has two practical consequences. First, when a soap opera shows a London landline on screen, it will almost always be 020 7946 something. Second, if you receive a real call presenting an 020 7946 XXXX CLI, that call is by definition spoofed. Treat it as a scam without further analysis. You can confirm the reserved status on the 020 directory page in our lookup tool, which flags the whole block.

How to verify if an 020 number is legitimate: a 4-step checklist

The single most effective defence against a London number scam 020 attempt is to refuse to act on information shared by an inbound caller. Use this four-step routine every time:

1. Hang up. No legitimate UK bank, government department, NHS service or courier will object to you ending the call and ringing them back. Pressure to stay on the line is itself a red flag.
2. Look up the number. Paste the full CLI into our Who Called Me lookup. For London ranges, drilling into /who-called-me/0207/ or /who-called-me/0203/ shows the original Ofcom block allocation and the carrier of record. A “Reserved” or “Unallocated” status is a strong fraud indicator.
3. Find the official number. Visit the organisation’s website directly (not via a link in a text), or check the back of your bank card. Ring that number on a different device if you can.
4. Never share OTPs or passwords on an inbound call. One-time passcodes exist precisely so they cannot be requested verbally. If the caller asks you to “confirm the code we just sent”, they are trying to authorise a transfer or login from their side.

For a broader walkthrough covering mobiles, withheld numbers and personal numbers, see our guide on how to find out who called from an unknown UK number, or the wider 2026 landscape in UK phone scams 2026: the 12 most common patterns.

Reporting an 020 scam

The UK has several reporting routes, and using more than one increases the chance of disruption to the scammer’s infrastructure.

• Action Fraud: 0300 123 2040 or actionfraud.police.uk for England, Wales and Northern Ireland. Police Scotland on 101 in Scotland.
• 7726 (SPAM): forward scam SMS to 7726 free of charge on any UK network. EE, O2, Three and Vodafone share the resulting feed with the National Cyber Security Centre.
• Your bank’s APP fraud line: printed on the back of your card. Faster reports give the bank a chance to recall the transfer under the CRM Code.
• Ofcom: spoofed-CLI patterns can be reported at ofcom.org.uk/nuisance-calls. Ofcom uses the data to enforce against carriers.
• FCA: for investment-scam variants, via the FCA reporting form.

Real London 020 numbers that are legitimate

For balance, the vast majority of 020 calls are real. A useful habit is to save the published switchboards for organisations that contact you regularly, so the CLI is recognised on first ring. Examples of widely published, legitimate London 020 numbers include:

• Metropolitan Police non-emergency switchboard: 020 7230 1212.
• NHS 111 (not 020, but worth memorising): dial 111 free from any UK phone for non-emergency medical help.
• Citizens Advice consumer helpline: 0808 223 1133 (an 0808 freephone rather than 020, but commonly confused).
• Transport for London contact centre: 0343 222 1234.
• HMRC general enquiries: 0300 200 3300. HMRC moved off 020 lines years ago, which is itself a useful scam tell.

Note how few of these are actually 020 numbers. Many large London-headquartered organisations have moved to 0300 or 0808 prefixes. So an inbound call presenting an old-style 020 7… number claiming to be from “HMRC” should immediately fail the sniff test on the prefix alone.

How The Business Hub’s Who Called Me tool helps for London numbers

Our free Who Called Me lookup is a clean copy of Ofcom’s National Telephone Numbering Plan, refreshed every Wednesday. For London-CLI calls specifically, it gives you four things on one screen:

• The Ofcom block allocation down to 1,000-number granularity, so you can see whether the CLI is in a real subscriber range, a reserved-for-drama range, or an entirely unallocated range.
• The original Communications Provider the block was assigned to (BT, Gamma, Voxbone, Vonage, and others). Spoofed numbers often present CLIs allocated to wholesale VoIP CPs that no high-street bank or HMRC would ever use.
• Drill-down pages for every London sub-prefix, including 020, 0207 (inner London, historic) and 0203 (overflow and newer allocations).
• An anonymous “recently searched” count, so you can see whether other UK users have looked up the same number in the last 90 days. A useful proxy for whether the number is in an active calling campaign.

If you take inbound calls as part of running an SME, pair the lookup with a proper call-management workflow. Read our companion guide on blocking unknown callers on iPhone, Android and business phone systems, and consider whether a managed-security baseline such as Cyber Essentials would suit the rest of your business.

Frequently asked questions

Is every 020 call a scam?

No. The 020 area code covers Greater London and contains tens of millions of legitimate landlines belonging to households, businesses, GPs, schools, courts and government offices. Scams form a small minority of total 020 traffic, but because criminals deliberately select 020 for its trustworthiness, the proportion of incoming nuisance calls that show an 020 CLI is higher than the underlying allocation would suggest.

What does the 020 7946 range mean?

The entire block 020 7946 0000 to 020 7946 9999 is reserved by Ofcom under Schedule 1 of the National Telephone Numbering Plan for fictional use in films, television, training videos and books. No real subscriber holds a number in this block, so any real-world call presenting an 020 7946 CLI is by definition spoofed and should be treated as a scam.

Are 0203, 0207 and 0208 different cities?

No. All three are sub-ranges of the same 020 area code, which covers all of Greater London. 0207 was historically inner London, 0208 outer London, and 0203 was added later as overflow. From a dialling perspective they are identical: you dial 020 followed by the 8-digit subscriber number, and a single business can hold lines across all three.

Can my bank really call me from an 020 number?

Most major UK banks now contact customers from 0345, 0800 or 03 prefixes rather than 020. Some London-headquartered private banks still use 020 lines for outbound fraud-team calls, but if you are not a private-bank client, an unsolicited 020 call claiming to be from your bank should be treated with strong suspicion. Hang up and ring the number on the back of your card.

How do I report an 020 scam call?

Report financial scams to Action Fraud on 0300 123 2040 or via actionfraud.police.uk, or to Police Scotland on 101. Forward scam SMS to 7726 free of charge. Report spoofed CLI patterns to Ofcom. If money has been transferred, contact your bank’s fraud line immediately: the sooner the report, the higher the chance of recall under the CRM Code.

Will registering with TPS stop 020 scam calls?

The Telephone Preference Service stops legitimate UK marketing calls but does not stop criminal cold-callers, who already operate outside the law. Registering is still worthwhile because anything that gets through after 28 days is statistically more likely to be a scam. See our walkthrough on registering with the Telephone Preference Service.