0333 050 4023
SpamSpammer, kept calling multiple times in a row
3 reports
• Last report 8 minutes ago
This number is a landline operated by Colt Technology Services and located in London, England. The overall user rating for this number is Negative. The number 02045838640 has been searched 585 times, with 9 user comments helping to identify the caller's intent.
Your comment helps others identify this number. Thank you for contributing!
At a glance
Community signals
- User reports: 9 user reports
- Searches: 585
- Last reported: 6 months ago
- First reported: 7 months ago
- Typical call time: before 3pm (95% of calls)
Number profile
- UK format: 020 4583 8640
- International: +442045838640
- Number type: Landline
- Carrier: Colt Technology Services
- Area: London
- Area code: 020
User Reports (9)
Your reports help others decide whether to answer calls from this number. Share your experience to help the community!
Scam/Fraud
21 Nov 2025
Said that they was calling from three but I’m not on three network. Apparently I qualified for a discount because of the phones lines going down
Scam/Fraud
21 Nov 2025
Three calls today which I didnt pick up. They called me before on a similar number saying my contract with 3 was running out. False.
Unknown Caller
19 Nov 2025
They called me but I did not pick up because I don't know anyone with a landlines who would call me from London and the call did not last for 30 seconds, it went cut so quickly. I did not take the call, I believe it's a scam!
Caller: Colt Technology Services
Unknown Caller
08 Nov 2025
Called twice however I didnt answer ether of them as I was not in the room. Each call only rang for less than about three rings as I would have heard
Scam/Fraud
08 Nov 2025
Claimed to be from three to talk about my contract but I’m not on three. Scam!
Unknown Caller
05 Nov 2025
I also have no idea what kind of company Colt Technology is, why they called me or how they obtained my number!
Spam
03 Nov 2025
Called twice and declined twice, then immediately called a third time. Answered this time and it was claiming to be for Three mobile, I’m not associated with Three mobile.
Unknown Caller
31 Oct 2025
Repeated calls this week.no message left. I have no idea who Colt Technology is or why they would be calling me.
Reported locations
Reported from 21 UK cities
Wallington, Ilmington, London (Shadwell), Mitcham, Thorne, Manchester, Sprowston, Birtley, Birmingham, Newcastle-under-Lyme, Liverpool, Keresley, Sudbury, Rushden, Kings Lynn, Camberwell, Colne, Ivinghoe, Tangmere, Batley, Acton
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How to Block This Number
On iPhone
- Open the Phone app and go to Recents
- Find the number 020 4583 8640 and tap the info icon (i)
- Scroll down and tap Block this Caller
- Confirm by tapping Block Contact
On Android
- Open the Phone app and tap the 3-dot menu
- Go to Call history or Recents
- Long press on 020 4583 8640
- Select Block number or Block/report spam
On Landline Phones
Several options are available for UK landlines:
- BT Call Protect - free for BT customers
- TalkTalk CallSafe - free for TalkTalk customers
- Call blocking devices like CPR Call Blocker (available on Amazon)
Register with TPS (Telephone Preference Service)
The TPS is a free service for UK consumers that allows you to opt out of unsolicited sales and marketing calls.
Learn more about TPS registrationLatest reports
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020 3932 4242
Unknown Callermessage left was garbled, couldn't understand
2 reports
• Last report 17 minutes ago
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Call Costs
Calling 02045838640 from a landline may cost up to 16p per minute. Many providers charge a 23p call set-up fee. Call packages often include these types of calls. You might not incur additional charges for calling this number, depending on your provider.
Dialling Instructions
Local UK callers can dial 02045838640 directly.
International callers should dial +44 20 4583 8640 or 0044 20 4583 8640. No leading zero is required when dialling abroad, e.g., +44(0)2045838640.