Glossary
E.164
Definition
The ITU standard for international phone number format: a plus sign, a country code, and the national number, up to fifteen digits total.
Why it matters
Written +33612345678, never 0612345678. The domestic trunk prefix — the leading 0 in most of Europe, 1 in North America, 8 in Russia and Kazakhstan — is dropped in E.164. Entering a number with the trunk prefix intact is the single most common reason a verification code never arrives.
Related reading
Sources
- ITU-T Recommendation E.164 — The international public telecommunication numbering plan · International Telecommunication UnionCountry calling codes, national significant number lengths, number structure
- ITU-T Recommendation E.123 — Notation for national and international telephone numbers · International Telecommunication UnionHow the example numbers on country pages are formatted
- RFC 3966 — The tel URI for Telephone Numbers · Internet Engineering Task ForceThe canonical machine format for the numbers quoted on this site
Part of the HushSMS glossary — 18 terms defined.