![]() As the international call prefix varies by country/region, the plus (+) sign is used to represent the international call prefix. Common international call prefixes are 011 (used within the NANP) or 00 (recommended by the International Telecommunication Union). An international call prefix is an example of a trunk prefix that allows you to enter a country code when calling a subscriber in another country/region. Being able to omit the area code is becoming less common, especially in the United States.Ī trunk prefix is one or more digits that must be entered prior to entering a subscriber’s telephone number. When calling a number within the area code, it might be possible to omit the area code. The subscriber number is 10 digits, with the first three digits being an area code that corresponds to a country or a regional service area. All countries in the NANP have a country code of 1. The North American Numbering Plan (NANP), used for telephone numbers in countries such as United States, Canada, and Jamaica, is a closed numbering plan. The standard requires that a telephone number has a maximum of 15 digits, separated as the first one to three digits as a country code and the remaining digits corresponding to the subscriber’s telephone number. ![]() ![]() The E.164 standard, published by the International Telecommunication Union as “The international public telecommunication numbering plan” is an open numbering plan that defines the format for international telephone numbers. Telephone numbering plans can be either a closed numbering plan with a fixed number of digits in each telephone number, or an open numbering plan with a variable number of digits. Telephone numbers are typically assigned to consumers of landline, mobile, and satellite phones according to national telephone numbering plans.
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