NoCall

+44 20 3481 5521

Risk level: High

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Who is this? Spam, telemarketing or a legitimate call? Community reports in United Kingdom.

High
Risk level
—
Category
0
Spam reports
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Last report

AI Analysis

Reports indicate persistent harassment and telemarketing calls from this UK number, often involving silent calls, repeated daily contact, and attempts to impersonate legitimate entities such as HMRC or O2. Callers use automated agents and sales pitches to extract personal information or cancel contracts under false pretenses.

Likely purpose: The number is used for persistent harassment, telemarketing, and scam operations, including impersonation of government agencies (HMRC) and telecom providers (O2) to extract personal data or financial information through deceptive calls.

Most common user complaints

  • Today Pure harassment, and on top of that never saying a word.
  • Always busy when you call back; also every single day…
  • Another call from this number: No message, no reason; also every single day.
  • yesterday Rings once and hangs up, to make it worse for no reason ugh
  • Yesterday Keeps calling even after blocking; also every single day
High dangerBlockTelecommunicationsCompany impersonationMissed call

AI analysis: 18 Oct 2026

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Information based on community reports and automated analysis. It may contain errors or be out of date, and is not legal advice or a verified accusation against the number's owner.

GB

United Kingdom

Operator information

Country:
GBUnited Kingdom
Prefix:
+44
Type:
Other
Operator:
EE, O2, Vodafone, Three

Recent searches

3 this week

Last 7 days

Community comments

12
Anonymous

Today Pure harassment, and on top of that never saying a word.

Anonymous

Always busy when you call back; also every single day…

Anonymous

Another call from this number: No message, no reason; also every single day.

Anonymous

yesterday Rings once and hangs up, to make it worse for no reason ugh

Anonymous

Yesterday Keeps calling even after blocking; also every single day

Anonymous

another call from this number: Sales pitch after sales pitch, to make it worse from other numbers too

Anonymous

Pure harassment, and on top of that for no reason.

Anonymous

Phishing call centre scam was reported as Línea de televentas con el número 020-34815521

Anonymous

Once I called them back I got automated agent starting with „if you want to cancel your contracts with some-name-of-fake-company” press 1. Immediately knew its a spam

Anonymous

Pretending to be from HMRC and collecting taxes

Anonymous

Called me twice this morning. Was silence as per call centre, male voice was hard to understand then he mentioned O2 network. Definitely a scam

Anonymous

I've missed some of these calls to my phone. But when I got it, it was a scam call centre trying to get me to give up my info

Report this number

What happened?

Signal summary for +44 20 3481 5521

+44 20 3481 5521 belongs to the 203 prefix and is classified as unclassified calls. This page combines no approved reports and 12 public comments to explain the risk level.

Frequently asked questions

Who calls from +44 20 3481 5521?
+44 20 3481 5521 is a phone number with the 203 prefix in United Kingdom. It has no spam reports yet, but you can check other users' comments below. Check the comments to find out who might be behind this call.
Is +44 20 3481 5521 a spam number?
There aren't enough reports yet to confirm whether +44 20 3481 5521 is spam. Check the risk score and the community comments.
Is it safe to call +44 20 3481 5521 back?
If you don't recognise the number and it has negative reports, it's best not to call +44 20 3481 5521 back. Avoid sharing personal or banking details with unknown numbers.
How can I block +44 20 3481 5521?
On iPhone, go to Recents in the Phone app, tap the (i) next to the number and choose 'Block this Caller'. On Android, long-press the number in your call history and select 'Block number'. You can also use the NoCall app to automatically block calls like +44 20 3481 5521.
Where can I report a suspicious call?
You can report +44 20 3481 5521 directly on this page using the report button. Your contribution helps other users identify unwanted calls.