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It means that someone has incorrectly formatted an international telephone number. It is never correct to have ++ in a telephone number.

The correct format is +Country City Number, with no punctuation other than the single plus sign and blank spaces to separate groups of digits.

+Country means the country code (one to three digits), preceded by a single plus sign

City means the city code or area code. In most (but not all) cases, you drop the trunk prefix 0 from the domestic code. Also, some countries do not have city codes at all.

Number is the subscriber number.

Examples:

  • +1 212 555 0123
  • +44 20 7496 0123
  • +678 00000

Incorrect format examples:

  • ++1 317 555 0987 : double plus is incorrect
  • +44 (0) 151 496 0987 : it is incorrect to use parentheses, and also incorrect to show the domestic-only trunk prefix in international format
  • +353 21 000 0123/4/5/6 : incorrect to use slashes, dashes, dots, etc.

(Note: all telephone numbers shown are fictitious examples for illustration only.)

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Q: What does plus plus mean in telephone dialling?
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