Remember the times when there were no mobile phones, even if they were there, only the richest and most influential people in the city had them. At that time, landline phones were the only way to talk to anyone outside. Now those who had those phones in their homes had the facility, but those who did not have a connection had to go to the nearby PCO booth and talk. Either one could talk on the phone by inserting a coin of 1 rupee, or one had to pay the bill after the conversation. Most people must have used them. Apart from PCO, there was also written about STD and ISD (What is STD, ISD and PCO) services at those shops. Do you know the full form of these three and the difference between them?
What is ISD?
Someone asked this question on Brainly, a website related to general knowledge, which has been answered. On the basis of that we are giving you the answer. In today’s time, making international calls is very easy, you can make audio and video calls through WhatsApp or other apps. But in olden times people had to make ISD calls to make international calls. ISD means International Subscriber Dialing. Every country has its own ISD code. India’s code is +91. You can make ISD call without any operator, you have to first dial the ISD code of that country and then dial the number.
After the advent of mobile phones, public calling booths disappeared. (Photo: Reddit)
What is PCOS?
PCO was also a service of Public Call Office which has now ended because now everyone has a phone. The full form of PCO is Public Call Office. This shows the telephone booths that used to exist across the country. PCOs were either coin operated or manual. In simple words, those telephone booths were called PCOs, through which the public could make calls.
What is STD?
Talking about STD, its full form was Subscriber Trunk Dialing. This was the calling facility which was available between two people who are present in different parts of the country. People have to mix the STD code of another city and the call gets made directly. There is no need for any operator in between.
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FIRST PUBLISHED: November 10, 2024, 07:31 IST
