full form of STD,ISD and PCO.where are these used
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ISD:International Subscriber dialling
PCO:Public Call Operator
STD:Subscriber Trunk Dialling
PCO:Public Call Operator
STD:Subscriber Trunk Dialling
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ISD:International Subscriber dialling
PCO:Public Call Operator
STD:Subscriber Trunk Dialling
these are all related to telephone service
PCO:Public Call Operator
STD:Subscriber Trunk Dialling
these are all related to telephone service
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