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How are international calling codes assigned?
The International Telecommunication Union (ITU) has established a comprehensive numbering plan, designated E. The standard defines a country calling code (country code) for each state or region which is prefixed to each national numbering plan telephone number for international destination routing.
What determines country code?
Country codes are a group of numbers you enter before dialing the number of the person in the country you are calling. The country code is entered after the international calling code or prefix. Each country has its own unique code. For example, the country code for the United States is +1.
How are phone codes determined?
International Telecommunication Union (ITU) recommendation defines the international public telecommunication numbering plan used in the PSTN. It also defines the format of phone numbers. As per these recommendations, numbers can have a maximum of 15 digits and are usually written with a + prefix.
How are phone numbers allocated?
When a customer signs up for service, mobile phone companies assign a number from a pool of available numbers. The available numbers are drawn from the blocks of numbers assigned through Bellcore/Telcordia and NANPA and consist of numbers not currently in use or which have not been used within the preceding 90 days.
What is the ISD code for USA?
1 is the ISD code of USA. +1 is the dialing code of USA. What is the dialing code for USA? The dialing code for USA is 001. What is ISD code? Country calling codes or country dial in codes are telephone dialing prefixes for the member countries of the International Telecommunication Union (ITU).
What is the ISD code for Afghanistan?
ISD Codes or Country Calling Codes Country Name ISD Code Åland Islands +358 18 Afghanistan +93 Albania +355 Algeria +213
What does +a plus sign before the ISD code mean?
A plus sign (+) before the ISD Code defines that the local international call prefix must be dialed first. 011 is the international calling code prefix for North American countries, while 00 is used for most of the European, Asian and African countries.
What is the ISD code for Iceland?
ISD Codes or Country Calling Codes Country Name ISD Code Iceland +354 India +91 Indonesia +62 Iran +98