High risk
0300 057 6929
AI Summary
Based on 12 community reports
This number, hosted on Gamma Telecom Holdings, is part of a tax refund scam targeting UK residents. Multiple reports describe fraudulent letters designed to look like official HMRC correspondence, claiming people are owed tax credits or refunds from years ago. The scammers then ask callers to provide bank details and sort codes to receive payments that don't actually exist.
The red flags are consistent across reports: legitimate HMRC contact numbers don't match this one (which you can verify on Gov.UK), the claims often reference tax credits people haven't received in years, and scammers immediately push for sensitive financial information. One caller reported the operator hung up when questioned about interest charges—typical avoidance behaviour.
Do not call this number or provide any bank details. If you receive a similar letter, contact HMRC directly using the number on their official website. Delete the letter and report it to Action Fraud.
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: HMRC or tax scam
Several community reports about this number describe the same experience.
Multiple reports mention a caller claiming to be from HMRC or a tax authority, references to HMRC, and messages referencing bank account or card details. This reported pattern suggests the displayed number may be used in a tax authority 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
- HMRC or tax scam
- Claimed organisation
- HMRC
- Personal data mentioned
- Bank account or card details
- Recommended action
- Do not use payment links; sign in to your tax account through GOV.UK directly.
12 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
12 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.
Got a letter that looked like it was from HMRC asking me to call a number and give my bank info. It said I was owed some tax credits, but I haven't had tax credits since 2012.
Letter arrived. which also had my NI Number , saying I was owed a tax refund and i should contact them so as to give them my bank details. Also the letter layout looks legit, but the phone number did not match HMRC contact number which you can find on Gov .UK website.
Said they were HMRC and you are owed money but they needed bank details to pay it! Also sending letters asking to call that number.
Letter from Hmrc saying I over paided tax credits.
Letter
Got a letter about tax credit overpayment from 2018, when I asked if it had interest added, he just hung up.
Got a letter that looked like it was from HMRC saying I paid too much on my Tax Credits. It seemed dodgy. I last got tax Credit in 2014
Got a letter saying it was from HMRC, they wanted me to call this number to give my bank details so I could get my tax refund. I checked HMRC online and I have no refunds due.
HMRC letter telling me to ring this number with my bank details and sort code so they could put a refund in my account.
Got a letter from “HMRC” with this number
This number is on what I think is a very good fake hmrc letter. They want bank details.
given in a letter from hmrc
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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
- 28 Mar 2026
- Last reviewed
- 10 Mar 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 0300 057 6929
What type of number is 0300 057 6929?
The phone number 0300 057 6929 (also written as +44 300 057 6929) is a number not tied to a geographic area . Calls to this number are charged at standard UK landline rates, often included in call packages.
Is 0300 057 6929 safe to answer?
Based on 12 community reports, this number has been frequently reported as spam or a potential scam. The current risk score is 95% with 10 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
12 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 12 of 12 reports classify it as spam or suspicious, and several reports describe the same hMRC or tax 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 12 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
- 0300 057 6929
- Country
- 🇬🇧 United Kingdom
- Network
- Gamma Telecom Holdings
- First Seen
- 23 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 hMRC or tax scam pattern reporters describe.
-
1
Do not use payment links
Do not pay a tax demand through a link in a text, email or phone call.
-
2
Sign in to GOV.UK directly
Check your real tax position by signing in to your account at GOV.UK, typed into your browser yourself.
-
3
Report it
Report HMRC impersonation through the official reporting routes on GOV.UK, and forward scam texts to 7726.
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.
Protection Guides
How to Block This Number
Clear instructions for iPhone, Android, and landlines
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