Answer / john

STD-subscriber trunk dialing.
ISD-international subscriber dialing.
pco-public call office.

Answer / shahnawaz alam

Std:-standard trunk dialling
Isd:-International subscriber dialling
Pco:-public call office

Answer / harsh varma

This answer is absolutely correct.
This answer makes everyone to know all about calls.
Thank you for your precious time given to the public for the information given by you thanks a lot as you share your knowledge with us. My mother used to say me that I am a fool but with your knowledge now I am able to answer or to understand the full forms of small letters thank you

Answer / naveen saini

STD= Subscriber trunk dialling
ISD= International subscriber trunk dialling
PCO= Public call officer

Answer / lal bahadur

Good

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