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

0800 023 4540 +44 800 023 4540

Freephone number, range allocated to BT · Also written +44 800 023 4540

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Nobody has reported 0800 023 4540 on Who Calls You yet.

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It was spam or a scam It was genuine Not sure
0Reports
-Marked as spam
5Lookups, last 30 days
31 Oct 2026Added

About 0800 023 4540

0800 023 4540 is a UK freephone number. It sits in the block 0800 023 4xxx, which Ofcom allocated to BT on 3 November 2004. One other number from that block has reports on Who Calls You (0% marked as spam). In the last 30 days it was looked up 5 times on Who Calls You, 3 of them in the past week, most recently on Fri 6 Nov. There are no reports about it yet: if it called you, you can be the first to say what the call was about. Calling it back is free from UK landlines and mobiles. We first listed it on 31 October 2026.

Number details

UK format
0800 023 4540
International
+44 800 023 4540
No spaces
08000234540
No spaces with +44
+448000234540
Number type
Freephone
Prefix
0800
Range allocated to
BT

Cost to call: Free to call · Freephone. Free to call from UK landlines and mobiles. UK call costs

0800 and 0808 numbers are free to call from UK landlines and mobiles. Companies use them for customer service and sales, so they also appear in sales calls.

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.

0800 023 4540 - who called me from 0800 023 4540? Freephone phone number, caller reports and spam check

Numbers in the same range (0800 023 4xxx)

0800 023 4540 is in the number block 0800 023 4xxx (1,000 numbers), allocated by Ofcom to BT on 3 Nov 2004.

On Who Calls You, 1 other number from this block has 1 report in total, 0% marked as spam.

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: 5 lookups and 0 reports on Who Calls You.

No reports in the last 30 days.

Reports about 0800 023 4540

No reports yet. If 0800 023 4540 called or texted you, your report helps other people decide whether to answer.

Report 0800 023 4540

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 0800 023 4540

Who called me from 0800 023 4540?

0800 023 4540 is a UK freephone number, range allocated to BT. Nobody has reported 0800 023 4540 on Who Calls You yet. It is also written as +44 800 023 4540, 08000234540 or +448000234540. 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 0800 023 4540 a scam?

There are no reports about 0800 023 4540 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 0800 023 4540?

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.