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Glossary · Updated 2026-10-20

What is E.164 phone number format?

E.164 is the international standard phone format: a plus sign, the country code and the number, with no spaces, e.g. +14155552671.

E.164 is the ITU standard for international phone numbers: +, the country calling code, then the national number, with no spaces or punctuation, up to 15 digits.

Typed E.164
(415) 555-2671, US +14155552671
07400 123456, UK +447400123456
0802 123 4567, Nigeria +2348021234567

Why store numbers this way

  • Every SMS and voice provider accepts it.
  • It makes duplicates easy to spot (07400 123456 and +44 7400 123456 are the same number).
  • It removes the guesswork of national prefixes.

Convert any number with the free phone validator, or see formats by country.

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