The invention of the telephone represented a great revolution in the field of telecommunications, by linking its inhabitants more quickly, overcoming mail and telegraph services. Its inventor, the Scottish scientist Alexander Graham Bell, patented it on March 7, 1876. Shortly after, in Mexico (1878), the first telephone connection was made between the police station of Mexico City and the police station of the people of Tlalpan.
The infrastructure of this new service began to take shape in the 1880s-1890s. The Mexican Telephone Company (later the Mexican Telephone and Telegraphic Company), and the Ericsson Telephone Company S.A. (L.M. Ericsson et al. ) were the most important firms that competed for public preference until the middle of the 20th century.