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

Harshit Singh , 4 Years ago

Grade 12th pass

1 Answers

Pawan Prajapati

Last Activity: 4 Years 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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