UK spam number checker

How the spam check works

Three independent signals power the spam verdict on every per-number page:

• Community spam reports. Approved threads in the WhoCalledLookup community that have tagged this UK number. Each thread is moderated against our editorial policy — duplicates, vendettas and defamation are removed before anything is published.
• Caller verdicts. One-tap scam, nuisance or safe ratings from other visitors who received a call from the exact digits, with optional short comments. Once anyone has rated the number, the page shows a 0–10 risk score based only on those verdicts; no score means nobody has rated it yet, not that it’s safe.
• Ofcom range holder. Structured data on which UK communications provider Ofcom originally allocated the block to. A number from an unfamiliar reseller block with no consumer-facing brand is an amber flag; a number from a major UK bank’s known outbound CLI block is a green one.

What counts as a UK spam number?

“Spam” covers a wide spectrum — different responses are appropriate for each. Loosely:

• Outright fraud. Bank-impersonation, courier phishing, HMRC arrest scams, tech-support remote-access scams. These actively try to steal money or credentials. Hang up immediately; never share codes, OTPs or card details on a call you didn’t initiate.
• Premium-rate ring-back. One-ring missed calls from 070 personal-numbering ranges that bill the caller heavily for calling back. Don’t return the call; block the prefix instead.
• Cold sales calls. Legal but unwelcome. The Telephone Preference Service tpsonline.org.uk cuts these within 28 days.
• Silent / abandoned calls. Calls that connect but don’t speak. Often a poorly-tuned auto-dialler in a legitimate UK contact centre rather than a scam. Persistent silent calls can be reported to Ofcom.

If a number checks out as a confirmed spam call

1. Don’t call back. Don’t engage. Don’t press any number to “remove yourself from the list” — that confirms a live line and gets you onto more dialler lists.
2. Block the number on your device. iOS Settings → Phone → Blocked. Android: open recent calls, tap the number, choose Block. Most UK networks also offer a my-account-level block.
3. Forward suspect texts to 7726 (spells SPAM on a phone keypad). Free on every UK network.
4. Report fraud to Report Fraud (which replaced Action Fraud in December 2025) on 0300 123 2040 (England, Wales, NI) or 101 (Police Scotland). Full reporting walkthrough in our reporting a UK scam call guide.
5. Add your own report. Start a community thread tagged with the number. Helps the next person who searches the same number see a richer signal.

A worked example from today’s reports

Take the number currently topping our community spam reports: +44 7473 953027, flagged in 2 approved spam threads. Running it through the checker pulls its Ofcom range holder, shows the caller verdicts other visitors have left, and links every community thread in one view — the same three-signal verdict you’ll get for any number you paste above. Across the 10 most-reported numbers on our board right now, 90% are mobiles (07) and 10% are geographic landlines (01/02), which is a fair picture of how UK spam campaigns spread their CLIs across number families.