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Country Code, ISD Code and ISO Code

ISD Codes stands for international subscriber dialing. They are telephone number prefixes for reaching telephone subscribers in the member countries' networks or regions of the International Telecommunication Union (ITU).

Country code is an integral part of the international telephone numbering system. They are necessary only when one needs to dial a telephone number to establish a call to another country. One needs to dial country codes before the national telephone number.

It is a rule to represent international telephone numbers by prefixing the country code with a plus sign (+). This also indicates to the subscriber to dial the local international call prefix first. For instance, the global call prefix in all North American Numbering Plan nations is 011, while it is 00 in generally European, Asian, and African nations.