What is the full form of ISD
ISD: International Subscriber Dialing
ISD stands for International Subscriber Dialing. It is also known as International Direct Dialing (IDD). This term describes an International telephone call made by a person without relying on the telephone operator.
ISD is assigned to every country. It is a specific number. A subscriber has to add this code before the individual's phone number to make any international call.
Other Full Forms of ISD