Spam phone calls are becoming an increasingly common nuisance in the UK. They are often designed to trick recipients into providing sensitive information, buying unnecessary products, or signing up for fraudulent services. Whether from cold-callers, robocalls, or scam artists, these unwanted calls can be frustrating and even dangerous.
In 2025, several phone numbers have emerged as the most reported sources of spam calls in the UK. In this article, we’ll explore the details of some of the most notorious numbers, offer insight into why they are flagged as spam, and provide tips on how to protect yourself from these calls.
Quick Overview of Top Reported Spam Numbers
Several phone numbers have gained notoriety for being linked to unsolicited, intrusive, or potentially fraudulent calls. These calls are typically designed to convince you to make unnecessary purchases or share sensitive information. Below, we’ll dive deeper into these numbers and their associated risks.
Is It a Scam? Analyzing the Numbers
Before diving into specific phone numbers, let’s first understand why certain numbers are considered to be spam. Most often, spam calls fall into categories like:
- Cold Calls: Typically from companies or individuals trying to sell products or services without your consent.
- Phishing Attempts: Calls that aim to trick individuals into revealing private or financial information.
- Robocalls: Automated calls often used to advertise products, services, or to scam individuals.
- Debt Collection: Some spam calls try to deceive people into thinking they owe money to a company or service.
Now, let’s take a closer look at the most reported spam numbers in the UK in 2025.
Table of Reported Spam Numbers
| Phone Number | Type of Spam | Reported Issues | What To Do |
| 01615274971 | Cold Call / Scam | Constant cold calls offering fake services | Block the number, report to your provider |
| 01702660930 | Robocall / Phishing | Claims to be from government organizations | Do not engage, block, report |
| 03301248035 | Debt Collection Scam | Pretends to collect unpaid bills or debts | Verify debts before responding, block |
| 01423645008 | Phishing / Financial Scam | Claims to be from banks asking for account details | Report to the bank, block |
| 07441107428 | Robocall / Fake Survey | Calls offering fake surveys for rewards | Ignore and block the number |
| 01615316278 | Cold Call / Scam | Fake energy savings or insurance offers | Block the number, mark as spam |
| 01234237085 | Scam / Fraudulent Investment | Promises high returns from fake investments | Avoid, report, and block the number |
| 03332421450 | Robocall / Unwanted Marketing | Advertising unwanted products or services | Block, report, and avoid engaging |
| 01615316131 | Robocall / Scam | Claims to be from tech support services | Do not share any personal info, block |
| 01214243333 | Phishing / Fraudulent Service Offer | Offers fake health or insurance services | Block the number, report to relevant authorities |
01615274971 – Cold Call / Scam
About the Number
The number 01615274971 has been reported numerous times for making unsolicited cold calls. Often associated with aggressive sales tactics, this number is frequently linked to scams promising discounts or fake services.
Common Complaints
Many people report that they receive daily calls from this number, with the caller offering various products like energy-saving solutions, travel deals, or even health-related services. The callers often push hard for immediate decisions, which is a classic sign of a scam.
Protection Tips
- Block the number immediately: If you’re receiving these calls, use your phone’s settings to block the number.
- Don’t share personal info: Never share your bank details, password, or any sensitive data over the phone unless you’re sure about the caller’s identity.
- Report the call: Use services like WhoCalledMe or TrueCaller to report this number as spam.
01702660930 – Robocall / Phishing
About the Number
01702660930 is often associated with robocalls and phishing attempts. These calls may claim to be from government or official agencies. They may request personal or financial details under the guise of “verifying your information.”
Common Complaints
Most victims report that the calls ask for sensitive details, such as credit card numbers or national insurance numbers, under the pretence of needing them for some official purpose. These types of phishing attempts are alarming and can lead to identity theft.
Protection Tips
- Hang up immediately: If you receive such a call, don’t engage. Simply hang up.
- Verify the information: If the caller claims to be from an official agency, contact them directly using the contact information on their website.
- Use anti-spam apps: Apps like TrueCaller can identify and block these numbers.
03301248035 – Debt Collection Scam
About the Number
Reports suggest that 03301248035 is frequently used for fake debt collection scams. The caller claims that you owe money for an unpaid bill and threatens legal action if you don’t settle immediately.
Common Complaints
Victims often report feeling pressured to make payments quickly. However, the numbers are not linked to legitimate debt collectors. The goal is to scare people into handing over money to fraudsters.
Protection Tips
Don’t pay immediately: Always ask for proof of the debt. Legitimate collectors will be able to provide documentation.
- Contact the company directly: If the debt relates to a legitimate service, call the company through verified numbers to confirm.
- Report the scam: Report this to the ICO (Information Commissioner’s Office) or Ofcom.
01423645008 – Phishing / Financial Scam
About the Number
01423645008 is known for phishing calls that pretend to come from well-known banks or financial institutions. These callers ask for sensitive details, claiming they need to “verify” your account information.
Common Complaints
Many people have reported that the callers know some personal details about them, which makes the call seem legitimate. They often ask for bank details or PIN numbers to “verify” your account.
Protection Tips
- Never give out personal information: Legitimate banks or financial institutions will never ask for such information over the phone.
- Report the number: Notify your bank or use platforms like WhoCalledMe or TrueCaller to block and report the number.
07441107428 – Robocall / Fake Survey
About the Number
The number 07441107428 is frequently reported for making robocalls offering fake surveys in exchange for rewards, discounts, or prizes. However, these offers are typically scams.
Common Complaints
The automated message claims you’ve been selected for a special survey that promises rewards. Once you participate, they may ask for credit card details to “process the prize.”
Protection Tips
- Don’t engage: Never respond to unsolicited survey or prize offers.
- Block the number: Use your phone’s blocking features or apps like TrueCaller.
- Report the scam: Alert others by reporting this number.
01615316278 – Cold Call / Scam
About the Number
01615316278 is another number associated with cold calling, offering services like insurance or fake financial products. They often use high-pressure tactics to try to get you to sign up quickly.
Common Complaints
Consumers report that this number often calls repeatedly, with persistent sales pitches that seem too good to be true.
Protection Tips
- Block and report: Block this number and report it to your phone provider or the relevant authorities.
- Be cautious with unsolicited offers: Always be wary of calls offering “too good to be true” deals.
01234237085 – Scam / Fraudulent Investment
About the Number
01234237085 is linked to fraudulent investment opportunities. The callers claim to offer high returns on investments in various markets, but they are just trying to steal your money.
Common Complaints
Victims report being lured into giving away large sums of money under the promise of lucrative returns. However, these “investments” are fraudulent, and the callers disappear once the money is transferred.
Protection Tips
- Don’t invest blindly: Always research any investment opportunities thoroughly before committing.
- Report fraudulent activities: Alert relevant authorities like Action Fraud.
03332421450 – Robocall / Unwanted Marketing
About the Number
03332421450 is known for unwanted marketing calls. These robocalls typically promote products or services that you haven’t requested.
Common Complaints
While some of these calls are for legitimate products, many are disruptive and irrelevant to the recipient, leading to frustration.
Protection Tips
- Register with TPS: The Telephone Preference Service (TPS) allows you to opt out of unsolicited marketing calls.
- Block unwanted calls: Use call-blocking apps to filter out spam.
01615316131 – Robocall / Scam
About the Number
This number, 01615316131, is another common robocall associated with scams, often claiming to be tech support services asking for remote access to your devices.
Common Complaints
Victims report that the call often claims to be from Microsoft or other tech companies and asks for remote access to “fix” computer issues, which is typically an attempt to steal sensitive data.
Protection Tips
- Don’t allow remote access: Never let anyone remotely access your computer or devices unless you’re sure of their legitimacy.
- Report the call: Use TrueCaller or your provider to block and report it.
01214243333 – Phishing / Fraudulent Service Offer
About the Number
Finally, 01214243333 is often linked to phishing calls, offering fraudulent services such as fake health insurance or fake warranty coverage for electronic devices.
Common Complaints
These calls often seem convincing and use high-pressure tactics to get individuals to sign up for services they don’t need.
Protection Tips
- Hang up immediately: Don’t engage with the caller.
- Report the number: Use platforms like WhoCalledMe or TrueCaller to report the number.
How to Block and Report These Calls
Blocking spam calls is an essential part of protecting yourself from scams. The following are some recommended steps:
- Use call-blocking apps: Apps like TrueCaller, Hiya, and Call Blocker can automatically block known spam numbers.
- Report to authorities: Report fraudulent or scam calls to Action Fraud, Ofcom, and ICO.
- Opt-out of marketing: Register with the Telephone Preference Service (TPS) to reduce unsolicited calls.
- Set up call screening: Many mobile phones have built-in features to screen or block spam calls.
Conclusion
Spam phone calls are an ongoing problem in the UK, with numerous phone numbers repeatedly flagged as sources of fraud, phishing, and marketing calls. By staying vigilant, blocking numbers, and reporting suspicious activity, you can protect yourself from falling victim to these scams. Always be cautious when receiving unsolicited calls, and if something seems too good to be true, it likely is.
Meta Description:
Explore the top reported spam phone numbers in the UK for 2025, including 01615274971, 01702660930, 03301248035, 01423645008, 07441107428, 01615316278, 01234237085, 03332421450, 01615316131, and 01214243333. Learn about common scams like cold calls, phishing, robocalls, and fraudulent services. Get tips on blocking and reporting these numbers to protect yourself from unwanted and potentially dangerous calls. Stay safe and informed!
