Telefónica's largest fixed-line operation in South America is in Brazil, where it provides broadband, local and long-distance telephone services in the aforementioned state, which alone represents the highest GDP of South America. It also owns a majority stake in the Brazilian mobile operator Vivo, having agreed on 28 July 2010 to buy Portugal Telecom's stake in the firm for €7.5 billion, after increasing its original offer by €1.8 billion over three months of incident-rich negotiations. The Telefónica group has been in the country since 1996 when it acquired CRT, a fixed-line and mobile operator in the southern part of the country. The landline division is currently part of Brasil Telecom. In July 1998 acquired Telesp, the telephony operator of the Telebrás system in the state of São Paulo, forming Telefônica Brasil.