How this site works

Where the data comes from

Ofcom, the UK communications regulator, runs the national telephone numbering plan. It publishes the full allocation register as open files: every dialling code, every number block within it, the block's status (allocated, free, protected) and the communications provider it was issued to. Ofcom aims to update these files every Wednesday.

We download those files, aggregate the blocks by dialling code and prefix, and generate a page per code. The figures you see (blocks allocated, operators, shares) are computed directly from the register with no editorial adjustment. Area names come from Ofcom's SABC designation list. The data on this build was retrieved on 2026-09-06 and covers 1,326 codes and prefixes.

The data is reproduced with acknowledgement to Ofcom under Ofcom's copyright and re-use terms. Call charge figures quote the regulated caps from Ofcom's call cost guidance.

What we publish

• Which place each geographic code serves
• Which phone companies hold number blocks in each code and range
• What each range costs to call, including the regulated caps
• Practical guidance on scam calls and every official reporting route

What we deliberately don't

We don't publish user-submitted reports about individual numbers, and we don't claim to identify individual callers. Both would make better clickbait, and both routinely smear wrong-number victims and small businesses. We also don't pretend a lookup can defeat caller ID spoofing. Where the data has limits, the page says so.

Corrections

Spotted something wrong? The underlying register is Ofcom's, but mistakes in our aggregation or writing are ours. Tell us and we'll fix it: hello@whocalledyou.uk.

Who runs this

WhoCalledYou.uk is an independent reference site. It has no connection to Ofcom or to any phone company. It may carry advertising or affiliate links for phone services; if a link pays us, it's marked, and it never changes what the data says. Start at the lookup or browse every UK area code.