STD full form
ISD full form
PCO full form
Where are these terms used?
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.
Last updated date: 31st May 2023
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