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  2. National conventions for writing telephone numbers - Wikipedia

    en.wikipedia.org/wiki/National_conventions_for...

    National conventions for writing telephone numbers vary by country. The International Telecommunication Union (ITU) publishes a recommendation entitled Notation for national and international telephone numbers, e-mail addresses and Web addresses. Recommendation E.123 specifies the format of telephone numbers assigned to telephones and similar communication endpoints in national telephone ...

  3. North American Numbering Plan - Wikipedia

    en.wikipedia.org/wiki/North_American_Numbering_Plan

    This rounded the total number of digits in a subscriber telephone number to ten: a three-digit area code, three-digit central office code, and four digits for each line. This fixed format defined the North American Numbering Plan as a closed numbering plan, [25] as opposed to developments in other countries where the number of digits was not fixed.

  4. Telephone numbers in the Americas - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_the...

    Telephone numbers in the Americas. All countries in the Americas use codes that start with "5", with the exception of the countries of the North American Numbering Plan, such as Canada and the United States, which use country code 1, and Greenland and Aruba with country codes starting with the digit "2", which mostly is used by countries in ...

  5. vCard - Wikipedia

    en.wikipedia.org/wiki/VCard

    vCard, also known as VCF (Virtual Contact File), is a file format standard for electronic business cards. vCards can be attached to e-mail messages, sent via Multimedia Messaging Service (MMS), on the World Wide Web, instant messaging, NFC or through QR code. They can contain name and address information, phone numbers, e-mail addresses, URLs, logos, photographs, and audio clips.

  6. Employer Identification Number - Wikipedia

    en.wikipedia.org/wiki/Employer_Identification_Number

    The Employer Identification Number (EIN), also known as the Federal Employer Identification Number (FEIN) or the Federal Tax Identification Number (FTIN), is a unique nine-digit number assigned by the Internal Revenue Service (IRS) to business entities operating in the United States for the purposes of identification.

  7. E.164 - Wikipedia

    en.wikipedia.org/wiki/E.164

    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. [1] 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 digits.

  8. United States passport - Wikipedia

    en.wikipedia.org/wiki/United_States_passport

    United States passports are passports issued to citizens and non-citizen nationals of the United States of America. [7] They are issued exclusively by the U.S. Department of State. [8] Besides passports (in booklet form), limited-use passport cards are issued subject to the same requirements. [9] It is unlawful for US citizens and nationals to enter or exit the country without a valid US ...

  9. Toll-free telephone numbers in the North American Numbering ...

    en.wikipedia.org/wiki/Toll-free_telephone...

    The format of the toll-free number is called a non-geographic number, in contrast to telephone numbers associated with households that are geographic. (Since the advent of cell phones and voice over IP, households can have any area code in the U.S., but it is still geographic in the sense that calls from that area code are considered local, but ...