Guides — page 7
Page 7 of 9. Long-form, citation-rich guides on UK telephone numbering, common scam patterns, and how to identify any UK caller using free public data.
- Safety
Spoofed UK numbers — how to spot and report them
How to spot a spoofed UK phone number — what CLI spoofing is, the four signs that give it away, how Ofcom's 2026 CLI authentication helps, and where to report.
15 May 2026
- Identify
UK mobile networks by 07 prefix
Which UK mobile network is allocated to each 07 prefix — EE, O2, Vodafone, Three and the MVNOs. Plus why ported numbers can be on a different network.
15 May 2026
- How it works
UK phone number portability — keep your number
How UK number portability actually works — PAC and STAC codes, One Touch Switch, why the Range Holder may not match the current network, what it means.
15 May 2026
- Reference
UK short codes — 999, 112, 101, 105, 116
UK short-code numbers explained — when to use 999 vs 112 vs 101, what 105 / 116 / 118 are for, and the free safety services every UK resident should know.
15 May 2026
- How it works
VoIP numbers UK — what they are, 056 vs 020
VoIP numbers UK explained — the 056 location-independent range, VoIP on geographic 020 / 0121 numbers, cost, who uses them, and how to identify a VoIP caller.
15 May 2026
- Safety
Withheld number UK — block, trace and 1471 / 1572
Withheld 'No Caller ID' calls in the UK — read the last withheld number with 1471, block with 1572, or request a Malicious Call Trace.
15 May 2026
- Reference
UK number cleansing for CRM — 2026 playbook
How to cleanse a UK phone-number list in your CRM — E.164 normalisation, libphonenumber validation, dedup, TPS suppression, carrier-aware checks.
11 May 2026
- Reference
UK phone number validation API — 2026 guide
Compare the major UK phone number validation APIs (Twilio, Numverify, Vonage, MessageBird) on accuracy, cost, carrier data and Ofcom-equivalent coverage.
10 May 2026
- Reference
Validate a UK mobile number (2026 guide)
How to validate a UK mobile number in 2026: format check, prefix check, libphonenumber-js code, plus carrier-aware paid APIs for bulk B2B work.
9 May 2026
- Reference
UK phone number format — E.164, regex, rules
The complete UK phone number format reference: E.164 spec, the libphonenumber regex, valid prefixes, length rules, and a working JavaScript validator.
8 May 2026
- Safety
Is this number a scam? UK fraud-call check
Is this UK number a scam? Use four free signals — Ofcom range data, community verdicts, spoofed-CLI red flags, conversation tells — to decide in 60 seconds.
6 May 2026
- Lookup
British phone number search — landline or mobile
British phone number search using free official Ofcom data and community caller reports. Find the provider, area, line type and reputation of any UK number.
4 May 2026