Unknown Caller
2 months ago
Answer machine switched on and there was a sound like a quiet horn for a micro second.
Community overview
Community rating:
Limited data
4 user reports
First reported 21 Aug 2026
·
Last reported
2 months
ago
About this number
Number formats
- UK format: 020 3504 2379
- International: +44 20 3504 2379
Number details
- Number type: Landline
- Number range allocated to: Core Telecom Limited
- Area: London
- Area code: 020
Recent activity
UK visits
User Reports
Last 30 days: 3 UK visits and 0 public reports.
Reported categories
Based on 4 public user reports
Unknown Caller
75% (3)
Robocall
25% (1)
User Reports (4)
Unknown Caller
2 months ago
silent call
Unknown Caller
2 months ago
Didn't leave answer phone message
Robocall
2 months ago
No message left when answerphone kicked in, except "Thank you for calling", typical call-centre robot response. 3rd such call in 2 hours this afternoon, from different numbers, 9th in last month, including 6 hosted/rented out by Core Telecom Ltd. High time the companies hosting/renting out numbers used in this way were fined too. We are TPS registered.
Reported caller:
Very annoyed
Report this number: 020 3504 2379
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How to Block This Number
On iPhone
- Open the Phone app and go to Recents
- Find the number 020 3504 2379 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 3504 2379
- 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)
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Learn more about TPS registration