Check whether a United Kingdom number is valid, detect its line type, and convert it to E.164, international, or national format — instantly and free. Powered by Google's libphonenumber.
| Country | United Kingdom (GB) |
| Country calling code | +44 |
| Example number (international) | +44 7400 123456 |
| National format | 07400 123456 |
| E.164 format | +447400123456 |
| RFC 3966 (tel: URI) | tel:+447400123456 |
| Example line type | mobile |
To dial a United Kingdom number from abroad, start with the country code +44 followed by the national subscriber number. In E.164 — the format every SMS gateway, CRM, and payment provider expects — the same number is stored as +447400123456: a leading +, the country code, and the national number with no spaces or separators.
The interactive tool above runs entirely in your browser. For server-side validation at scale — sign-up forms, lead cleaning, SMS routing — call the API. One GET request, no SDK, works in any language.
# Validate a United Kingdom number via the API curl "https://phone-validation-and-formatting.p.rapidapi.com/v1/validate?number=%2B447400123456" \ -H "X-RapidAPI-Key: YOUR_KEY" \ -H "X-RapidAPI-Host: phone-validation-and-formatting.p.rapidapi.com"
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The country calling code for United Kingdom is +44. A full number in international (E.164) form looks like +447400123456.
A typical United Kingdom mobile number is written +44 7400 123456 internationally, 07400 123456 nationally, or +447400123456 in E.164 format.
Send one GET request to the Phone Validation API with the number and country code "GB". The response tells you whether it is valid, the line type, and every standard format. A free tier is available.
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