Environmental Sciences, asked by bh3ik1ashaika, 1 year ago

Full form of STD,ISD and PCO.where are these used

Answers

Answered by Tanuja4321

3

ISD - International Subscriber Dialling

STD - Standard Trunk Dialling

PCO - Public Call Office

Answered by DIVINEREALM

66

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ISD

International Subscriber Dialling

STD

Standard Trunk Dialling

PCO

Public Call Office

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