Social Sciences, asked by vishalChacko, 1 year ago

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

Answers

Answered by vikassethi2000
1
ISD:International Subscriber dialling
PCO:Public Call Operator
STD:Subscriber Trunk Dialling

Answered by syedaleemuddin
0
ISD:International Subscriber dialling 
PCO:Public Call Operator 
STD:Subscriber Trunk Dialling 



these are all related to telephone service

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