What is PCO, STD, ISD?

PCO - Public Call Office
  • is a telephone facility located in a public place.
STD - Subscriber Trunk Dialling
  • is a term for a telephone system allowing subscribers to dial trunk calls without operator assistance.
ISD - International Subscriber Dialling
  • is the process of an international telephone call being placed by the caller (the subscriber) rather than by an operator.

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