Who rang me in the UK - Who Calls You UK Reverse Phone Number Lookup Report a number

020 4520 8403 +44 20 4520 8403

Landline number from London, range allocated to TELNYX UK LIMITED · Also written +44 20 4520 8403

No reports yet

Nobody has reported 020 4520 8403 on Who Calls You yet.

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It was spam or a scam It was genuine Not sure
0Reports
-Marked as spam
6Lookups, last 30 days
29 Oct 2026Added

About 020 4520 8403

020 4520 8403 is a landline number from London (area code 020). It sits in the block 020 4520 xxxx, which Ofcom allocated to TELNYX UK LIMITED on 28 April 2020. People searched for it 4 times in the last 7 days and 6 times in the last 30 days, most recently yesterday. Nobody has reported it yet, so if it called you, your report will be the first. Calling it back costs the same as a normal UK call. We first listed it on 29 October 2026.

Number details

UK format
020 4520 8403
International
+44 20 4520 8403
No spaces
02045208403
No spaces with +44
+442045208403
Number type
Landline
Location
London
Area code
020
Range allocated to
TELNYX UK LIMITED

Cost to call: Normal rate · Landline (02). A normal UK landline call, included in the minutes of most landline and mobile plans. UK call costs

Landline numbers for London (020), Cardiff (029), Northern Ireland (028) and a few other areas. Calls cost the same as a normal UK landline call.

Network details come from UK numbering allocations. The number may have moved to another provider since, and this does not show who made a call.

020 4520 8403 - who called me from 020 4520 8403? Landline phone number from London, caller reports and spam check

Numbers in the same range (020 4520 xxxx)

020 4520 8403 is in the number block 020 4520 xxxx (10,000 numbers), allocated by Ofcom to TELNYX UK LIMITED on 28 Apr 2020.

We know 7 other numbers from this block, but nobody has reported them yet.

Companies and call centres often use numbers from one block, so reports about nearby numbers can be a useful hint. They are not proof about this number: blocks are shared, and numbers can be moved to another provider.

Recent activity

Last 30 days: 6 lookups and 0 reports on Who Calls You.

No reports in the last 30 days.

Reports about 020 4520 8403

No reports yet. If 020 4520 8403 called or texted you, your report helps other people decide whether to answer.

Report 020 4520 8403

How did they contact you?
What was it?

Do not include names, addresses or other personal details. Read our rules.

What you should do

  • Do not share personal or bank details with an unexpected caller. Banks, HMRC and the police never ask for PINs, passwords or one-time codes.
  • Do not call back blindly. If the caller claims to be a company, contact it on the number from its official website, your card or a letter. For your bank you can call 159. Should you call back an unknown number?
  • Block the number if the calls are unwanted (see below).
  • Report it above, and report scams to Action Fraud. Forward scam texts to 7726 for free.

Caller ID can be faked. Scammers can make any number appear on your screen, including real numbers of real businesses or people. A report here is information to help you decide, not proof of who called.

Questions about 020 4520 8403

Who called me from 020 4520 8403?

020 4520 8403 is a UK landline number from London, range allocated to TELNYX UK LIMITED. Nobody has reported 020 4520 8403 on Who Calls You yet. It is also written as +44 20 4520 8403, 02045208403 or +442045208403. We do not show who owns a number. Caller ID can be faked, so check the reports and never share personal details with a caller you do not know.

Is 020 4520 8403 a scam?

There are no reports about 020 4520 8403 yet, so we cannot say. Be careful with unexpected calls asking for money, passwords or bank details, and add a report if this number called you.

How do I block 020 4520 8403?

On iPhone open Recents, tap the (i) next to the number and choose Block Caller. On Android open the call log, press and hold the number and choose Block. On a landline, ask your provider about free call blocking such as BT Call Protect.