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WhoCalledLookup
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Sources & references

Every primary source WhoCalledLookup cites across its lookup tools, cornerstone guides and result pages. This is the single authoritative bibliography for the site — the same source registry every guide pulls from, presented as a single page so readers and AI engines can audit provenance without walking the entire blog.

37 sources listed. Last reviewed: . See the methodology for how each source is used.

Ofcom

The UK telecoms regulator. The Numbering Data feed is the source of every range-holder result on the site; the Numbering Plan and the various CLI and call-charge documents are the regulatory backdrop for the cornerstone guides.

Government & regulators

Statutory bodies whose published guidance underpins the safety and reporting routes on the site.

Industry standards & developer references

The international standards and open-source libraries that define UK phone-number format, validation and line-type intelligence.

UK public services

Statutory consumer services we cite when recommending the right number to ring for a given situation.

Consumer community sources

Independent public community boards and consumer-protection resources. We do not search or import them; they are listed so you can check a number there yourself.