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020 3970 0425 Negative Who called me from this phone number?

London • Colt Technology Services
This number is a landline operated by Colt Technology Services and located in London, UK. The overall user rating for this number is Negative. The number 02039700425 has been searched 245 times, with 10 user comments helping to identify the caller's intent.
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At a glance

Community signals

  • User reports: 10 user reports
  • Searches: 245
  • Last reported: 5 months ago
  • First reported: over 5 years ago
  • Typical call time: before 1pm (94% of calls)

Number profile

  • UK format: 020 3970 0425
  • International: +442039700425
  • Number type: Landline
  • Carrier: Colt Technology Services
  • Area: London
  • Area code: 020

User Reports (10)

Your reports help others decide whether to answer calls from this number. Share your experience to help the community!

Unknown Caller
09 Dec 2025

Jess from BT called on 0203 9700425 asking about some maintenance work that is due to be carried out on 23rd December. No idea what he was taking about. Advised me to get someone who could help him. Put the phone down

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Scam/Fraud
05 Dec 2025

Called claiming to be from BT Maintenance asking about my phone line, was fairly rude and was demanding info. They hung up when I said no.

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Spam
03 Dec 2025

Called claiming to be from BT Maintenance asking about the condition of my phone line. Very odd

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Scam/Fraud
15 Dec 2020

Typical HMRC fraud call, stay safe ingonore it and dont fall for it!

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Scam/Fraud
15 Dec 2020

Called claiming to be HMRC Dennis Gray twice, both calls were an automated voice

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Scam/Fraud
15 Dec 2020

Fraud call claiming to be HMRC! Fraud in messageabove re officer Dennis Gray too! note spelling of grey, plus caller has an Americann accent and asks you to get a lawyer immediately and call their time limited call. Absurd!

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Spam
15 Dec 2020

Yes they did the same to me

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Scam/Fraud
15 Dec 2020

HRMC FRAUD CALLER

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Scam/Fraud
15 Dec 2020

Fraud about Tax return ...

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Spam
15 Dec 2020

caller left message, officer Dennis Gray - do not disregard and call back, if not call back or get solicitor to call back, I will have to suffer the legal consequences.

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What type of call was it?

Reported locations

Reported from 21 UK cities

Royal Tunbridge Wells, Camberwell, Leven, Mexborough, Chelmsford, Stoke-on-Trent, Hatfield, Rugby, Sunderland, Islington, Croydon, Birmingham (Witton), Carshalton, Warrington, Newbury, Broadstairs, Manchester, Portree, Billingham, Parkstone, Birmingham (The Royal Town of Sutton Coldfield)

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How to Block This Number

On iPhone

  1. Open the Phone app and go to Recents
  2. Find the number 020 3970 0425 and tap the info icon (i)
  3. Scroll down and tap Block this Caller
  4. Confirm by tapping Block Contact

On Android

  1. Open the Phone app and tap the 3-dot menu
  2. Go to Call history or Recents
  3. Long press on 020 3970 0425
  4. 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 registration

Latest reports

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Call Costs

Calling 02039700425 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 02039700425 directly.

International callers should dial +44 20 3970 0425 or 0044 20 3970 0425. No leading zero is required when dialling abroad, e.g., +44(0)2039700425.