The UK Phone Number Directory
Every UK area code mapped to its location, every UK telecoms operator that holds number ranges with Ofcom, and live rankings drawn from 1,250,172 first-party number lookups on this site. This is the directory; for a one-off number check use the free UK Phone Number Checker.
How UK phone numbers work
Every UK number begins with a leading zero followed by a 2–5 digit prefix. The prefix tells you the type of line and, for geographic numbers, roughly where it terminates: 020 for London, 0113 for Leeds, 0207/0203 for sub-ranges within Greater London. Mobile numbers start with 07, freephone numbers with 0800 or 0808, and business rate numbers (the “non-geographic” ranges) with 03, 084, 087, or 09.
Behind each prefix sits a list of communications providers Ofcom has allocated number blocks to. Those allocations are public — we mirror them in our database and link each one to the operator's directory page. So when you look up a single number, you can also follow the chain backwards to see every other range that operator manages.
What makes this directory useful rather than just a list, however, is the second layer: real lookups people on this site have already run. The most-searched and most-reported pages, the per-month trend snapshots, the spam-pattern call-outs on each area-code page — all of that is built from 762,286 distinct numbers our visitors have checked and 3,749 community comments left behind on individual number pages.
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The directory in numbers
UK Area Codes
627
Operators
19
Numbers Checked
762,286
Community Reports
3,749
UK area codes — busiest first
Each card links to a per-code page with sub-areas, common scam patterns reported locally, the operators serving that exchange, and the top-searched numbers in the range. Lookup counts are first-party and rolling.
UK operators with Ofcom number allocations
These are the UK communications providers Ofcom has issued number blocks to. The page for each operator lists the most-searched numbers from their ranges plus any community spam reports.
Live rankings — updated daily
Rolling lists built from yesterday's snapshot of our lookup log and community-reported spam scores. Mobile numbers are masked to the last four digits in line with our privacy policy.
Most-searched UK numbers
Live ranking →
Top 100 numbers by lookup volume.
Top reported scam numbers
Live ranking →
Numbers with the highest community spam-score.
Monthly trend snapshots
Each month we freeze a snapshot of the top-searched numbers as a historical record — useful for tracking how scam-call campaigns rotate phone numbers month-to-month.
Spam calls · June 2026
Open snapshot →
Spam calls · May 2026
Open snapshot →
Spam calls · April 2026
Open snapshot →
Want to look up a specific number?
This directory is built for browsing. For a one-off check, the UK Phone Number Checker takes any UK number and returns its Ofcom range holder, line type, area, risk level, and any community comments already on file — usually in under a second.
Checking a US or Canadian (+1) number? This directory only covers the UK numbering plan — for North American numbers, use our sister site WhoCalledLookup.com, which runs the same free lookup against carrier records and FCC robocall-complaint data.