E.164 is an international standard for telephone numbering that specifies the structure and format of phone numbers used in public telecommunication networks. Established by the International Telecommunication Union (ITU), E.164 defines a numbering plan that helps ensure that numbers can be dialed internationally and are unique worldwide. The key features of the E.164 format include: 1. **Number Length**: E.164 numbers can be a maximum of 15 digits long, including the country code but excluding any formatting characters.
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