What is the Full Form of ISD?
International Subscriber Dialing is the full form of the ISD. Every country is assigned a unique ISD code. Whenever an individual wants to make an international call, then he/she must add that unique ISD code of the particular country as a prefix before the phone number of the dialed individual.
ISD Full Form
The full form of ISD is International Subscriber Dialing. An ISD code is used to make international calls from anywhere in the World. These calls can be directly dialed by the telephone subscribers or an individual without the need to depend on any telephone operator. ISD is also referred to as International Direct Dialing (IDD).