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020 3878 7423 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, England. The overall user rating for this number is Negative. The number 02038787423 has been searched 91 times, with 5 user comments helping to identify the caller's intent.
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At a glance

Community signals

  • User reports: 5 user reports
  • Searches: 91
  • Last reported: 5 months ago
  • First reported: 5 months ago
  • Typical call time: before 3pm (94% of calls)

Number profile

  • UK format: 020 3878 7423
  • International: +442038787423
  • Number type: Landline
  • Carrier: Colt Technology Services
  • Area: London
  • Area code: 020

User Reports (5)

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

Scam/Fraud
16 Dec 2025

Seems to be a scammer, be careful.

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Scam/Fraud
16 Dec 2025

Said they were EE and I could get 40% discount as signal was poor in my area. They sent me an email which looked just like an EE email and asked to provide a code to reset password. There was a warning on the email. I questioned it and the caller said he’d call back. I called EE and they said it was a scam. Nevertheless the scammers tried to call me back several times - even when I asked them not to.

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Unknown Caller
15 Dec 2025

Said they were EE and I was selected to get 40% off my bills. I hung up.

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Unknown Caller
13 Dec 2025

Called but didn’t leave a voicemail. Didn’t recognise so didn’t answer.

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Unknown Caller
12 Dec 2025

Called me twice. No voicemail

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What type of call was it?

Reported locations

Reported from 21 UK cities

Dudley, Taunton, London, Barry, Hook, Dundee, Chilworth, Hayes, Egham, Saint Andrews Quay, Manchester, Hale Barns, Dorchester, Faversham, Sidcup, Edgware, London, Herne Bay, Pelsall, Birmingham, Hoddesdon

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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 3878 7423 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 3878 7423
  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 02038787423 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 02038787423 directly.

International callers should dial +44 20 3878 7423 or 0044 20 3878 7423. No leading zero is required when dialling abroad, e.g., +44(0)2038787423.