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    What is E.164?

    Also known as: International format, E164

    E.164 is the international telephone numbering standard. A number in E.164 format starts with a plus sign and the country code, contains digits only, and is at most 15 digits long — for example +61412345678.

    SMS platforms require E.164 because a local number is ambiguous without a country. An Australian mobile written as 0412 345 678 becomes +61412345678: the leading zero is dropped and the country code 61 takes its place.

    Most delivery failures on imported lists trace back to formatting: spaces, brackets, leading zeros left in place, or numbers mangled into scientific notation by a spreadsheet.

    Texto and E.164

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