E.164
ITU-T Recommendation for telephone numbering
E.164
E.164 is an international standard (ITU-T Recommendation), titled The international public telecommunication numbering plan, that defines a numbering plan for the worldwide public switched telephone network (PSTN) and some other data networks. E.164 defines a general format for international telephone numbers. Plan-conforming telephone numbers are limited to only digits and to a maximum of fifteen digits. The specification divides the digit string into a country code of one to three digits, and the subscriber telephone number of a maximum of twelve to fourteen digits. For global services, the country code has always three digits and the subscriber number a maximum of twelve digits.
Read on Wikipedia · Image Maximilian Dörrbecker (Chumwa), CC BY-SA 2.5
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