High risk
020 3856 4111
AI Summary
Based on 8 community reports
This London-based number on the Gamma Telecom network is generating a very high spam score, and multiple reports describe impersonation scams targeting both households and organisations. Callers falsely claim to represent energy suppliers like British Gas and EDF, using tactics like knowing your current rates or targeting charities with misleading tariff offers. Some reports describe callers requesting copies of utility bills or personal information, which is a classic scam red flag. The pattern suggests this is likely an organised operation targeting people with high-pressure sales pitches about energy deals. Don't engage with these calls, never share bill copies or personal details, and always verify directly with your actual energy supplier using a number from their official website or card. Block the number and report it to your provider.
Written automatically by AI from the community reports on this page. It does not set the spam score, and it can make mistakes, so read the reports below as well.
Pattern detected: Energy supplier scam
Several community reports about this number describe the same experience.
Multiple reports mention a caller claiming to be from an energy supplier, and references to British Gas. This reported pattern suggests the displayed number may be used in an energy supplier impersonation attempt.
Based on screened community reports only. Caller ID can be spoofed, so reports may describe misuse of the displayed number rather than the registered number owner.
Common details reported
Details that appear in two or more community reports about this number.
- Reported scam type
- Energy supplier scam
- Claimed organisation
- British Gas
- Recommended action
- Contact your energy supplier directly using the number on a recent bill before acting on any claim.
8 moderated reports
Every report on this page was screened automatically and then approved by a moderator before being published and counted towards the score. How moderation works
Cumulative spam score based on all reports up to each month. Higher percentage means higher reported scam risk. Cumulative spam score based on all reports up to each week. Higher percentage means higher reported scam risk. Cumulative spam score based on all reports up to each day. Higher percentage means higher reported scam risk.
Most helpful reports
8 totalSubmitted by users and shown as written, so wording and spelling are their own. Each report is screened and approved by the CallerCheck Moderation Team before it appears.
Woman called saying she could get me better fuel rates than my current supplier. She seemed to know what i was already paying, and said she could beat it. She wanted me to send copies of my bills, which i havent done. When i looked into her phone number, it looks like it is probably a scam.
I've had a few calls about a utility contract for a Scout Group where I'm a Trustee. They keep asking for the Treasurer. I told them I'm not the Treasurer and have requested that my number be taken off their list.
Pretended to be EDF energy
MabeEva, electricity scam
Called at 8:15 UK time
Keep getting calls saying they are from British Gas. Told them our charity signed up with them. We are with BRITISH GAS DIRECT.
"Daisy" said she was from British Gas and told me the charity was on the business tariff rate when it should be on a charity tariff.
It seemed dodgy right away, and the caller's accent made me even more wary.
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How this page was checked
This profile is built from community reports, lookup activity and CallerCheck risk signals. It is not written by hand for this number, so the details below show who checks what and when it last changed. The risk score is based on community reports about calls and texts from this displayed number. It is not based on official records of who owns the number.
- Reports moderated by
- CallerCheck Moderation Team
- Safety guidance reviewed by
- CallerCheck Editorial Team
- AI summary
- Generated from approved community reports only
- Last report received
- 17 Apr 2026
- Last reviewed
- 27 Feb 2026
- AI summary last generated
- 31 Aug 2026
- Last materially updated
- 31 Aug 2026
What do these dates mean?
Report and lookup dates come from user activity. Review dates show when CallerCheck last checked reports, safety guidance, or risk signals. We use “last materially updated” only for meaningful page changes, not cosmetic changes.
- First seen:
- when this number first appeared on CallerCheck, through its first lookup or report.
- Last report received:
- the most recent approved community report for this number.
- Last lookup:
- the most recent time a user searched for this number.
- AI summary last generated:
- when the AI summary on this page was last rewritten from the approved community reports.
- Last reviewed:
- the most recent human moderation or editorial review, where available.
- Last materially updated:
- the most recent meaningful change to this page: a new approved report, a risk score change, an AI summary regeneration, a moderation action, or a claim or dispute change. It does not move for cosmetic changes.
Sources and safety guidance
- Community reports about this number, screened before they are published or counted. How moderation works
- Ofcom numbering allocation data for the network this range belongs to
- Safety guidance aligned with UK scam-reporting advice, such as Action Fraud guidance, forwarding spam texts to 7726, and the 159 banking helpline where relevant. Where to report a nuisance call
Important limits
Caller ID can be spoofed, so a high risk rating means people have reported suspicious activity involving this displayed number. It does not prove that the registered owner of the number made the call or text. Community reports describe individual experiences and are not official confirmation of a scam. How caller ID spoofing works.
Own or manage this number? If this number belongs to you or your organisation, you can claim or dispute this profile. We review claims, check supporting information, and may update the page if reports appear to involve spoofing, mistaken identity, or outdated information. Claim or dispute this number
About 020 3856 4111
What type of number is 020 3856 4111?
The phone number 020 3856 4111 (also written as +44 20 3856 4111) is a UK landline number originating from the London area in Greater London . Calls to this number are charged at standard UK landline rates, usually included in call packages.
Is 020 3856 4111 safe to answer?
Based on 8 community reports, this number has been frequently reported as spam or a potential scam. The current risk score is 96% with 7 reports marking it as spam .
Exercise extreme caution if you receive a call from this number. Do not share personal or financial information.
What this data can and cannot tell you
Everything on this page comes from reports submitted by members of the public about calls and texts that showed this number. Caller ID can be spoofed, so the person contacting you may not be the genuine holder of the number, and a legitimate number can be misused. Before paying anything or acting on a message, check the claim with the organisation involved using contact details from its official website or letters, never the ones in the message itself.
More on nuisance calls
Safety score
8 reportsHow this score was worked out
Each report rates the number as safe, unknown, suspicious or spam. The score blends those ratings, giving more weight to the more serious ones, and a number with only a few reports is held closer to neutral until more arrive. Feedback votes on reports can also influence it slightly. Scores of 70% and above count as high risk, 40% to 69% as medium, and below 40% as low. More about spam scores
Why this number is rated High Risk
This number is rated High Risk because 8 of 8 reports classify it as spam or suspicious, and several reports describe the same energy supplier scam. No reports identify the number as safe or expected.
Ratings reflect screened community reports, not official records. How the spam score works.
Confidence: High
Based on 8 community reports with repeated matching details. Confidence describes how much report evidence sits behind this page, and is separate from the spam score.
Caller ID can be spoofed, so reports may describe misuse of the displayed number rather than the registered number owner.
Details
- Tel Number
- 020 3856 4111
- Country
- 🇬🇧 United Kingdom
- Network
- Gamma Telecom Holdings
- Area
- London
- Type
- Geographic
- Coverage
- London and the surrounding area
- Cost to call
- Standard landline rate
- First Seen
- 28 Jan 2026
Network shows the operator this number range is allocated to in Ofcom numbering data, so the caller may be on a different network if the number was moved or spoofed. First Seen is the date this number first appeared on CallerCheck.
What To Do Now
Steps that fit the energy supplier scam pattern reporters describe.
-
1
Do not share personal or payment details
Do not give personal information, card details or security codes to an unexpected caller or message.
-
2
Verify independently
If the caller claimed to be an organisation, find its official contact details yourself and check the claim directly.
-
3
Block and report the number
Stop further contact from 020 3856 4111 and forward scam texts to 7726. How to block a number on any phone.
Already paid or shared bank details? Call your bank straight away using the number on the back of your card, or dial 159 to be connected to your bank securely.
Call Types
Breakdown of reported call reasons. Larger segments and bars represent a bigger share of reports.
Location
London, United Kingdom
This number originates from the London area code region. The map shows the general geographic area, not an exact location.
Protection Guides
How to Block This Number
Clear instructions for iPhone, Android, and landlines
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