Top Reported Spam Phone Numbers in UK (2025)

In the digital age, the menace of spam calls has escalated to an alarming level. Across the United Kingdom, thousands of people are plagued daily by unsolicited phone calls. These spam calls come in various forms—from fake insurance claims and scam competitions to fraudulent banking calls and tech support impersonations. In 2025, a series of phone numbers have surfaced as the most reported for suspicious or fraudulent activity. Understanding these numbers and the nature of their scams is the first step toward protecting yourself and your loved ones.

Below is a compiled list of the Top Reported Spam Phone Numbers in the UK (2025) based on user reports, complaints, and public scam monitoring platforms.

Table of Top Spam Numbers in the UK (2025)

Phone Number	Type of Spam/Scam	Common Tactic	User Warning Level
01977 788417	Amazon Prime Scam	Fake subscription charges	High
02045792608	HMRC Impersonation	Threat of arrest/fraud	High
02039277564	Energy Rebate Scam	Fake government rebate offers	Medium
01865950244	Tech Support Fraud	Microsoft/Windows fake support	High
08008620271	Bank Impersonation	Fraud alerts, card blocked scams	High
02039676770	Compensation Call	Fake accident claim offers	Medium
03316303353	Insurance Renewal Scam	Auto-renewal of non-existent policies	Medium
03301244030	Phishing for Personal Info	Asking for address and DOB	High
02037589440	Cryptocurrency Investment Scam	Fake crypto investment platforms	High
02070434505	National Insurance Number Scam	Claims of number misuse or suspension	High

Detailed Breakdown of Each Spam Number

01977 788417 – Amazon Prime Scam

This number has been linked to a widespread scam involving fake Amazon Prime subscription charges. Callers typically claim that the recipient’s Amazon Prime subscription is about to be renewed for a high amount, usually around £79.99. To cancel, the recipient is asked to press a number on their keypad or speak to a representative. This leads to attempts to collect personal banking information.

• Red Flag: Amazon never calls to confirm subscriptions this way.
  
• Advice: Hang up immediately and do not press any buttons. Report to Action Fraud.
  

02045792608 – HMRC Impersonation

This number is one of the most frequently reported HMRC impersonation scams. Victims are threatened with legal action or arrest due to alleged tax fraud or unpaid taxes. The scammers aim to instill panic and push victims into sharing National Insurance numbers, personal details, or even paying “penalties” via gift cards or wire transfers.

• Red Flag: HMRC does not contact people in this threatening manner.
  
• Advice: Never share personal information over the phone unless you have verified the caller.
  

02039277564 – Energy Rebate Scam

Claiming to be affiliated with government energy programs, callers from this number offer rebates or discounts on your energy bills. They ask for details of your utility provider and then request direct debit information to “apply the rebate”.

• Red Flag: Government energy support schemes are usually publicized via official letters or websites.
  
• Advice: Avoid sharing any utility or bank information over unsolicited calls.
  

01865950244 – Tech Support Fraud

Scammers using this number pretend to be from Microsoft, saying your computer has a virus or has been hacked. They will then walk you through downloading remote access software like TeamViewer or AnyDesk, ultimately gaining control of your system and potentially stealing sensitive data.

• Red Flag: Microsoft never initiates unsolicited support calls.
  
• Advice: Hang up, run antivirus software, and monitor accounts for suspicious activity.
  

08008620271 – Bank Impersonation (Lloyds/HSBC/NatWest)

This number impersonates various UK banks. Victims report automated messages saying their bank card has been used fraudulently. The message urges you to “press 1” to speak to the fraud department. Once connected, they ask for security codes and other sensitive details.

• Red Flag: Banks do not ask for full PINs or passwords via phone.
  
• Advice: End the call and use official bank numbers from your bank card or website.
  

02039676770 – Compensation Call

Check Recent Spamming Numbers:
03316303320: : 03316307363: : 02080754322: : 08000668919: : 02039277527

This number is associated with nuisance calls claiming the person is owed compensation from a recent accident. The caller often does not know whether you’ve actually had an accident and uses vague language to get you to confirm details that can be used for insurance fraud or data harvesting.

• Red Flag: Any legitimate claim would come via post or email, not an unsolicited call.
  
• Advice: Don’t confirm or deny anything—simply hang up.
  

03316303353 – Insurance Renewal Scam

Callers from this number claim to be from your car or home insurance company, stating that your policy is up for renewal. They try to trick you into confirming your identity and bank information, despite having no real connection with your insurer.

• Red Flag: Real insurance companies don’t cold-call for renewals without previous contact.
  
• Advice: Contact your insurer directly to check policy status.
  

03301244030 – Phishing for Personal Information

This number is frequently reported for phishing attempts. Callers say they need to “verify your identity” for a delivery, subscription, or tax rebate. They request details like your full name, date of birth, address, or even National Insurance number.

• Red Flag: Vague reason for the call and requests for detailed personal info.
  
• Advice: Never provide personal information over an unverified call.
  

02037589440 – Cryptocurrency Investment Scam

Callers from this number promote “exclusive investment opportunities” in cryptocurrency. They may mention well-known companies or claim government backing. These scams often start with small investments and gradually coerce larger amounts under the guise of multiplying profits.

• Red Flag: Promises of high returns with no risk are classic signs of a scam.
  
• Advice: Always do your research and avoid sharing banking details.
  

02070434505 – National Insurance Number Scam

Posing as government officials, these callers warn you that your National Insurance number has been “suspended” due to suspicious activity. They may request to “verify” your information or threaten police involvement if you don’t comply.

• Red Flag: The government does not suspend NI numbers or threaten over the phone.
  
• Advice: Hang up and report the call to the National Fraud and Cyber Crime Reporting Centre.
  

How to Spot a Spam Call

Spam calls often have common characteristics:

1. Urgency or threats: Scammers rely on fear to manipulate victims.
   
2. Too good to be true offers: Fake prizes, rebates, or “once-in-a-lifetime” investments.
   
3. Requests for personal/banking details: Always a major red flag.
   
4. Unsolicited technical help: No legit company will call about your computer unless you contacted them first.
   

What to Do If You Receive a Spam Call

• Don’t engage: Avoid pressing buttons or responding in any way.
  
• Hang up immediately.
  
• Block the number on your device.
  
• Report the call to the relevant authority, such as Action Fraud (www.actionfraud.police.uk).
  
• Inform your bank if you’ve given out any sensitive details.
  

Tools and Resources to Protect Yourself

Here are some tools and services to help prevent spam calls:

• TPS (Telephone Preference Service): Free UK service to opt-out of unsolicited sales and marketing calls.
  
• Truecaller or Hiya: Apps that identify known scam numbers.
  
• Ofcom’s Call Blocking Guides: Details about setting up call filters on landlines and mobiles.
  

Final Thoughts

The surge in spam and scam calls in the UK is a growing concern. While telecom regulators and technology companies are working on implementing better call-filtering systems, the best defense remains awareness. Knowing the numbers to watch out for and understanding the tactics of fraudsters can drastically reduce your risk.

If a call doesn’t feel right—trust your instincts, hang up, and verify independently.