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  1. E.164 standard is the most frequently mentioned for International Telephone Number Format. E.164 is an ITU-T recommendation, titled The International Public Telecommunication numbering plan. E.164 standard was Numbering Plan for the ISDN Era.

  2. The national conventions for writing telephone numbers vary by country. While international standards exist in the form of the International Telecommunication Union sector ITU-T issued recommendation E.123, national telephone numbering plans define the format and length of telephone numbers assigned to telephones.

  3. People also ask

    What's the standard format for International phone numbers?

    Do you have to punctuate International phone numbers?

    Do you put a 0 in the middle of an international phone number?

    How do you write the country code on a telephone number?

  4. No, there is not a universal convention for writing phone numbers. The ten digit area code-exchange-number of the US is not universally used. Other countries, especially smaller ones, may or may not have exchanges and don’t need ten digits. SO the number and grouping are all different by country.

  5. The international notation of phone numbers is defined in ITU standard E.123 and basically starts with a +, followed by the country code, a regular width non breaking space, the area code, space, local number. Usually, inside the local number, narrow non breaking spaces are used to break down the local number in groups of two or three for legibility.

  6. A valid phone number in international format is as the following example [country code] [network prefix] [number] 44 831 1234567. National dialing codes when calling internationally. In several countries, you may need to add a zero (0) when dialing a number inside the same country.

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