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What is STD full form ISD full form PCO full form Where are these terms used?

What is

STD full form

ISD full form

PCO full form

Where are these terms used?

Grade:12th pass

1 Answers

Pawan Prajapati
askIITians Faculty 9723 Points
20 days ago
STD full form is Subscriber Trunk Dialling ISD full form is International Subscriber Dialling PCO full form is Public Call Office The terms STD ISD PCO are used in the telephone system. They allow subscribers to dial trunk calls without operator assistance through trunk lines.

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