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ITU-T Recommendation E.164 international public telecommunication numbering plan

Defines the international public telecommunication numbering plan and the 15-digit maximum international number length used by dialable E.164 phone-number storage and routing.

Read with a purpose

What this source can teach

Use this source to check a technical or accessibility requirement against its exact wording and scope.

  1. Start with the original. Open the source and find the guidance or example relevant to your task.
  2. Trace the connection. Use the claim notes below to see how this site applies the source to specific patterns.
  3. Check the setting. Compare the source's platform, people, and constraints with your own decision.

Pattern Decisions This Source Supports

Pattern Supported decision Required contract Claim note
Phone number entry Choose phone number entry when the product genuinely needs a telephone route for calls, SMS messages, identity recovery, service contact, delivery coordination, support callbacks, or account verification. Users can type, paste, autofill, edit, select, undo, and correct the phone value through native input behavior. ITU E.164 supports international telephone numbering and the 15-digit maximum international number length.

Evidence Role

This source is treated as spec evidence. Its value comes from the specific claims and setting described above.

Publisher: International Telecommunication Union. Last checked: .

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