PCO Full Form is Public Call Office. PCO is a telephone facility, which is offered in public places to facilitate the public in India. Though these have almost vanished from the streets of major cities, there are still certain places in the cities and small towns where PCOs are found. It is a coin operated pay phone system, which is automated or manned. BSNL is a public sector firm, which organized the largest installations of PCOs all over India.
However, few private sector operations like Tata Indicom, Reliance, Idea, Airtel, etc. who have installed PCOs moderately in public areas. There are two kinds of PCOs-wireless and landlines. Wireless PCOs apply two major technologies such as GSM and CDMA. Tata Indicom and Reliance are pre-paid PCOs with CDMA technology. On the other hand, Idea, Hutch, and Airtel, are GSM based connections.