Question

what are difference between STD and ISD​

Answer 1

This is a kind of public calling facility available for general civilians or public without having any personal phone services or facilities. ... Similar to ISD,it does not require the involvement of mediator or telephone operator,however,STD doesn't provide international calling facility such as ISD...

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Answer 2

Explanation:

STD and ISD are associated with telephone network.

STD and ISD are associated with telephone network.STD: Stands for subscriber trunk dialing. It was called when subscribers used to make long distance calls without operators assistance. But these days we hardly hear this as calling became very easy with introduction of new advanced networks.

STD and ISD are associated with telephone network.STD: Stands for subscriber trunk dialing. It was called when subscribers used to make long distance calls without operators assistance. But these days we hardly hear this as calling became very easy with introduction of new advanced networks.ISD: Stands for International subscriber dialing. This term is used when calls are made out of the country