High risk
07840543634
AI Summary
Based on 2 community reports
This O2 mobile number is calling people with a banking scam. Callers claim to be from your bank, mentioning suspicious transactions on Amazon and Zoo, then ask you to press 1 to approve or 2 to speak to someone. This is a classic phishing tactic designed to trick you into confirming your account details or authorising fraudulent payments.
Your bank will never call you asking to press buttons to verify transactions. If you receive a call like this, hang up immediately and contact your bank directly using the number on your card or their official website. Never press any keys or provide personal information in response to unsolicited calls.
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.
2 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
2 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.
Said he was from my bank about some transactions on Amazon and Zoo I had not used before. Asked me to press 1 to approve the transaction and 2 to speak to someone.
Claimed to be from my bank re transactions with Amazon and Zoo that I had not used before. Asked me to press 1 to approve transaction and 2 to speak to someone.
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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
- 31 Jul 2026
- Last reviewed
- 03 Aug 2026
- AI summary last generated
- 03 Aug 2026
- Last materially updated
- 03 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 07840 543634
What type of number is 07840 543634?
The phone number 07840543634 (also written as +44 7840 543634) is a UK mobile number . Calls to this number are charged at standard mobile rates, usually included in your minutes allowance.
Is 07840 543634 safe to answer?
Based on 2 community reports, this number has been frequently reported as spam or a potential scam. The current risk score is 75% with 1 report 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
2 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 2 of 2 reports classify it as spam or suspicious, and several reports describe the same bank impersonation scam. No reports identify the number as safe or expected.
Ratings reflect screened community reports, not official records. How the spam score works.
Confidence: Medium
Based on 2 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
- 07840 543634
- Country
- 🇬🇧 United Kingdom
- Network
- O2
- Area
- UK Mobile
- Type
- Mobile
- Coverage
- UK-wide, no fixed location
- Cost to call
- Standard mobile rate
- First Seen
- 31 Jul 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 bank impersonation scam pattern reporters describe.
-
1
Never share codes
Do not share one-time passcodes, app approval codes or full banking passwords. A genuine bank will never ask for them.
-
2
Hang up and call back
End the call, then contact your bank using the number on the back of your card or a recent statement.
-
3
Use 159
In the UK you can dial 159 to be connected securely to most major banks.
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
Courier Fraud
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Caller ID Spoofing
Scammers can make any number appear on your phone, including your bank's real one. How spoofing works, how to spot it, and what to do if your own number is being used.
"Safe Account" Push Payment Scams
Criminals call pretending to be your bank and tell you to move money to a safe account. The account belongs to them. How these scams work, the new reimbursement rules, and what to do.
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We review claims carefully and may keep warnings visible where community reports still indicate risk.