Around 1890, the telephone service extended westward out of Port of Spain to Carenage and then onwards to one customer in Chaguaramas.

In the early 1900s, the government operated telephone lines in rural areas, namely from Arima to Manzanilla and from San Fernando to Cedros.

In 1968, the Government entered into a partnership with Continental Telephone of the United States, to whom it sold fifty percent of the holdings.

Over the years, automatic step-by-step exchanges were gradually extended to suburban and urban areas as the company sought to keep pace with the development of the country.

A loan agreement was signed in 1974 with the World Bank for 18 million dollars to carry out a massive development programme.

In 1979, the government contracted Nippon Electric of Japan for the supply and installation of 48,000 additional lines and associated equipment.

Between 1983 and 1989, DMS-100 digital switches were installed throughout the country and, as a result of this new technology, training of employees became a significant factor.

The company acquired the assets of Cable and Wireless in Trinidad and Tobago and assumed responsibility for external telecommunications, commencing 1 January 1970.

[11] However lagging behind their competitor, Columbus Communications, they still have a large portion of the market secured due to their previous copper network.

The service in question, has not lived up to expectations, which is mainly due poor performance attributed to the over-saturation of users and lack of available bandwidth.

[16] TSTT has entered the electronic surveillance market as well by launching their "Blink Vigilance" (now bsecure) service with an optional armed response add-on.