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"ISD" stands for International Subscriber Dialing. An ISD code is a country code, or a country code and city code, often quoted with the local international access prefix. For example, the country code and city code for London, England, UK, is +44 20, so in many countries people will quote the ISD code for London as 004420. However, it is more appropriate to quote it as +44 20, since different countries use different prefixes for outbound international calls.

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Q: What does ISD code stand for?
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