020 3504 3840

Mixed

Community overview

Community rating: Mixed

4 user reports

First reported 13 Feb 2026 Last reported 2 months ago

About this number

Number formats

  • UK format: 020 3504 3840
  • International: +44 20 3504 3840

Number details

  • Number type: Landline
  • Number range allocated to: Core Telecom Limited
  • Area: London
  • Area code: 020

Recent activity

UK visits
User Reports

Last 90 days: 4 UK visits and 1 public report. Visit data is unavailable for part of this period.

Visit data is unavailable for part of this period.

Reported categories

Based on 4 public user reports

Unknown Caller
75% (3)
Scam/Fraud
25% (1)

User Reports (4)

Unknown Caller
2 months ago

Caller said they were from a wholesale company called xxxxxx limited. And they got my number offline.

Reported caller: Dave
Scam/Fraud
8 months ago

asked for me by name,said my insurance with severn trent water was up.When i asked where they got my number fron she put the phone down

Unknown Caller
8 months ago

Asked if it was me by name and put phone down

Unknown Caller
8 months ago

The caller asked me if I wanted to renew a water insurance policy which I took out three years ago. It seemed genuine but I have no recollection of taking out the policy. He didn't 'push it'. I'm wondering if the conversation was a means of obtaining my voice data?

Report this number: 020 3504 3840

↑ Back to reports

Did this number contact you?

How to Block This Number

On iPhone

  1. Open the Phone app and go to Recents
  2. Find the number 020 3504 3840 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 3504 3840
  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

Reports for the same area code

Recommended Guides

Check another number

Currently active UK phone numbers

UK phone numbers that have recently shown increased activity or interest.