Direct Distance Dialing (DDD) is a system that allows long-distance calls to be made without operator assistance, introducing more autonomy to users.
An in-depth exploration of 'Ma Bell', its origins, history, and significance in telecommunications.
An in-depth exploration of POTS (Plain Old Telephone Service), the traditional telephone service using analog signal transmission, including historical context, technology, applicability, comparisons with modern systems, and more.
A long-distance operator-assisted call where the caller specifies the name of the person being called and is not required to pay if the individual is unavailable.
