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Telephone country codes are one-, two-, or three-digit codes identifying a country or external territory. For a complete list, see the related links. Some countries have separate codes for mobile phones, but others do not.
Different countries use different systems for postal codes. Some just have numbers and some use numbers and letters. Some don't use postal codes at all. It depends on the country, so the question cannot be given a definitive answer.
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There are several different kinds of country codes for different purposes. Telephone country codes can be found in the related links.
This are codes for every country that are assigned for the International Aviation Trasportation Association, for international flights...
Country codes do not begin with zero.
There is a partial list at the related site below.
Area code 0014 is not assigned to any specific country. Area codes generally vary from country to country, with each country having its own unique set of area codes.
Each country (or in a couple of cases, group of countries) has its own internal telephone numbering system. Country codes provide a uniform system of dialing out of your own country's system into a different country.
BGD is Bangladesh in the ISO 3166-1 alpha-3 system. Three-letter country codes are not used for telephone country codes or Internet domains, but are used for various purposes including passport codes.
Kiribati is country code +686. There are no city codes or area codes. The local number is 5 digits.
The country code 23177 does not correspond to a specific country. Country codes typically follow a format established by ISO standards, such as ISO 3166-1 alpha-2 or alpha-3 codes. If you are referring to a specific context, such as postal codes or international dialing codes, please provide more details for accurate identification.