Surtalina Telecom

1974-1993
CTS was founded in 1974 as a spin-off from Companhia Surtalina de Correios, Telefones e Telégrafos.

1993-1999
In 1993, CTS' acronym meaning was changed to Companhia de Telecomunicações Surtalina to better reflect their other services outside landline telephony.

1999-2007
In 1999, CTS' name was simplified to Surtalina Telecom (usually shortened to Surtatel, then ST since 2015).