The Telepac brand dates from the time when Portugal Telecom didn't yet exist. It was used beginning in 1985 by Telefones de Lisboa e Porto (TLP) and Correios, Telefones e Telégrafos (CTT) for its Videotex services. It was the property of Transdata, a joint venture between CTT and TLP.
In 1992, a merger with CTT created Telecom Portugal, which didn't modify the videotex management. Between 1992 and 1995, they started to offer internet services.
In 1999, they became the ISP of SAPO.
- "Cria o Serviço Público de Comunicação de Dados por Pacotes, assegurado através da sede TELEPAC, e aprova o seu regulamento" (in Portuguese). Ministério do Equipamento Social. May 18, 1985. Retrieved May 26, 2012.