The Mexican Telephone Company was founded in 1882, subsidized by the Bell Telephone Co. of Boston, Massachusetts. It was one of the first to provide this service to the capital city. In 1891 he published his List of Subscribers with just over 800 lucky owners of a telephone line, a figure that would reach 1,110 in 1899; the following year it already served 18 cities in the interior with little more than three thousand telephones.On the 18th of February of 1905 this company, with more than a million dollars in capital, changed its name to Compañía Telefónica y Telegráfica Mexicana (CTTM) turning into in a subsidiary of the International Telephone and Tellegraph Co (ITT). The Ministry of Communications and Public Works granted a concession to this new company in 1907 to use the federal network, and thus continue providing telephone service in the country’s capital. The CTTM used digits and letters on the dials of its telephone sets: A-1, F-2, H-3…