Unwanted calls are a persistent nuisance, and in 2025, several phone numbers in the UK have emerged as particularly problematic. These numbers are frequently reported for scams, fraudulent schemes, and aggressive marketing tactics. If you’ve recently received a call from one of these numbers, you’re not alone. Here, we’ll break down the most reported spam phone numbers in the UK this year, providing you with insights into their origins, common complaints, and tips on how to protect yourself.
Quick Overview of the Top Spam Numbers
Here’s a quick overview of the most commonly reported spam numbers in the UK for 2025:
| Phone Number | Type of Call | Common Complaints | Location |
| 01977 788417 | Scam/Marketing | Energy scams, aggressive sales tactics | Pontefract, England |
| 02045792608 | Scam/Phishing | Fake HMRC calls, financial fraud attempts | London, England |
| 02039277564 | Scam/Marketing | Insurance scams, fake investment offers | London, England |
| 01865950244 | Scam/Phishing | Tech support scams, identity theft | Oxford, England |
| 08008620271 | Marketing/Spam | Unsolicited insurance and loan offers | UK-wide, Toll-free |
| 02039676770 | Scam/Phishing | Fake banking alerts, identity theft | London, England |
| 03316303353 | Marketing/Spam | Unwanted business loan offers | UK-wide, Non-geographic |
| 03301244030 | Marketing/Spam | Unsolicited business services | UK-wide, Non-geographic |
| 02037589440 | Scam/Phishing | Fake legal threats, aggressive tactics | London, England |
| 02070434505 | Scam/Phishing | Tech support scams, fake Microsoft alerts | London, England |
Detailed Breakdown of Each Number
01977 788417 – Energy Scams from Pontefract
This number has been frequently reported for aggressive energy-related scams, often pretending to be from legitimate energy providers. Callers typically pressure individuals to switch providers or share sensitive information under the guise of cost-saving offers. Many recipients report high-pressure tactics and misleading claims about government rebates or energy savings.
02045792608 – Fake HMRC Calls from London
This London-based number is notorious for posing as HMRC, attempting to trick recipients into believing they owe unpaid taxes or have legal issues. Scammers often threaten arrest or financial penalties, creating a sense of urgency to extract personal and financial information.
02039277564 – Insurance Scams and Fake Investments
Known for pushing fake investment opportunities and dubious insurance products, this number is linked to a series of financial scams. Callers may try to lure victims with promises of high returns or exclusive deals, only to disappear once payments are made.
01865950244 – Tech Support Scams from Oxford
This number is associated with classic tech support scams, where callers claim your computer has been compromised and offer expensive, unnecessary services to “fix” the problem. Often, these scams target the elderly or those less familiar with digital security.
08008620271 – Unsolicited Insurance and Loan Offers
This toll-free number has been linked to aggressive marketing campaigns for insurance products and high-interest loans. Recipients often report multiple daily calls, sometimes even after asking to be removed from call lists.
02039676770 – Fake Banking Alerts
Scammers using this number often impersonate banks or financial institutions, warning of “suspicious activity” on your account to trick you into revealing personal details.
03316303353 – Unwanted Business Loan Offers
This non-geographic number is frequently used by aggressive marketing firms offering unsolicited business loans, often with misleading terms and conditions.
03301244030 – Unsolicited Business Services
Similar to the previous entry, this number is used for unwanted business services, often targeting small business owners with persistent calls and aggressive sales tactics.
02037589440 – Fake Legal Threats
This number is associated with fake legal threats, including claims of pending lawsuits or unpaid debts, often attempting to scare recipients into making quick payments.
02070434505 – Tech Support Scams
Commonly linked to fake Microsoft support scams, this number is known for attempts to gain remote access to computers or steal sensitive data under the guise of technical assistance.
How to Protect Yourself
- Use call blocking apps like TrueCaller, RoboKiller, or the built-in spam filters on your phone.
- Register with the Telephone Preference Service (TPS) to reduce unwanted calls.
- Report suspicious numbers to the Information Commissioner’s Office (ICO) or Action Fraud.
- Never share personal or financial information over the phone unless you’re certain of the caller’s identity.
- Trust your instincts – if a call seems suspicious, it probably is.
Final Thoughts – Stay Vigilant!
Spam calls are a frustrating reality, but staying informed can help you avoid falling victim to these scams. Remember to report suspicious numbers and share your experiences with others to raise awareness. If you’ve encountered any of these numbers, consider blocking them and reporting them to the appropriate authorities.
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Discover the top reported spam phone numbers in the UK for 2025, including 01977 788417, 02045792608, 02039277564, 01865950244, 08008620271, 02039676770, 03316303353, 03301244030, 02037589440, and 02070434505. Learn how to identify and block these nuisance calls to stay safe.
