020 3504 1604
Also shown as:
- 020 3504 1604
- +44 20 3504 1604
AI Summary
Based on 1 community report
Calls from this London number, associated with Core Telecom, have been reported as giving a "number not available" message. With only one report and no upvotes or downvotes yet, it's difficult to say for sure if this is a scam or simply a technical issue. However, the high spam score suggests caution. If you receive this call, it's best to ignore it and consider blocking the number.
1 verified report
Cumulative spam score based on all reports up to each month. Higher percentage means higher reported scam risk. Cumulative spam score based on all reports up to each week. Higher percentage means higher reported scam risk. Cumulative spam score based on all reports up to each day. Higher percentage means higher reported scam risk.
Most helpful reports
1 totalnumber not available message
Share Your Experience
Help others by reporting what happened
About 020 3504 1604
What type of number is 020 3504 1604?
The phone number 020 3504 1604 (also written as +44 20 3504 1604) is a UK landline number originating from the London area in Greater London . Calls to this number are charged at standard UK landline rates, usually included in call packages.
Is 020 3504 1604 safe to answer?
Based on 1 community report, this number has been frequently reported as spam or a potential scam. The current risk score is 80% with 1 report marking it as spam .
Exercise extreme caution if you receive a call from this number. Do not share personal or financial information.
More on nuisance calls
Safety Score
Details
- Tel Number
- 020 3504 1604
- Country
- 🇬🇧 United Kingdom
- Network
- Core Telecom
- Area
- London
- Type
- Geographic
- First Seen
- 25 Aug 2026
Protection Guides
How to Block This Number
Step-by-step instructions for iPhone, Android, and landlines
Spam Calls From US Numbers
Getting calls from unknown US numbers starting with +1? Why UK phones ring with American numbers, what the common scams are, and how to report them.
Accident Claims Cold Calls
Getting calls about a car accident you never had? How accident claims cold calls work in the UK, where they get your number, and how to report them to the ICO.
Silent and Abandoned Calls
Your phone rings, you answer, and nobody speaks. What causes silent and abandoned calls in the UK, when to worry, and how to report them to Ofcom.
Location
London, United Kingdom
This number originates from the London area code region. The map shows the general geographic area, not an exact location.
Call Types
Breakdown of reported call reasons. Larger segments and bars represent a bigger share of reports.
Is this your number?
Claim ownership to manage reports
We'll verify ownership via callback or documentation