Question 1

What is STD?

Accepted Answer

STD (Subscriber Trunk Dialing): STD is a telecommunications term used in India and a few other countries. It refers to the system that allows subscribers to make long-distance domestic calls within the country without the need for operator assistance. With STD, users can dial a specific code or prefix followed by the area code and the phone number to make a long-distance call.

Question 2

What is ISD?

Accepted Answer

ISD (International Subscriber Dialing): ISD is a telecommunications term used globally. It enables subscribers to make international calls to other countries. To make an ISD call, users need to dial an international access code, followed by the country code, area code (if applicable) and the recipient's phone number.

Question 3

What is PCO?

Accepted Answer

PCO (Public Call Office): PCO refers to a public telephone booth or facility that provides telephone services to the public. In countries like India, PCOs are common in public places such as markets, train stations, bus terminals and commercial areas. They typically have multiple telephone booths equipped with coin-operated or card-based payment systems. PCOs allow people without personal phones or those looking for affordable telephone services to make local, long-distance or international calls.

Question 4

What is the use of a PCO booth?

Accepted Answer

PCO booths are especially useful for people who do not have personal phones or travellers who need to make calls while away from their home network. These booths offer a convenient and accessible way to communicate without requiring a long-term subscription or personal phone device.
However, with the increasing prevalence of mobile phones and widespread access to personal telecommunication devices, the use of PCO booths has decreased in most areas. Nonetheless, they still serve as a viable option for certain individuals and can be found in various public settings, such as train stations, bus terminals and markets.

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