Brazil has both modern technologies in the center-south portion, counting with LTE, 3G HSPA, DSL ISDB based Digital TV. Other areas of the country, particularly the North and Northeast regions, lack even basic analog PSTN telephone lines. This is a problem that the government is trying to solve by linking the liberation of new technologies such as WiMax and FTTH) only tied with compromises on extension of the service to less populated regions. 

The Brazilian landline sector is fully open to competition and continues to attract operators. The bulk of the market is divided between four operators: Telefónica, América Móvil, Oi (controlled by Brazilian investors and Portugal Telecom), and GVT. Telefónica operates through Telefónica Brasil, which has integrated its landline and mobile services under the brand name Vivo. The América Móvil group in Brazil comprises long distance incumbent Embratel, mobile operator Claro, and cable TV provider Net Serviços. The group has started to integrate its landline and mobile services under the brand name Claro, previously used only for mobile services. Oi offers landline and mobile services under the Oi brand name. GVT is the country’s most successful alternative network provider, offering landline services only. 

"National:" extensive microwave radio relay system and a national satellite system with 64 earth stations.
what are they?
Telefónica, América Móvil, Oi (controlled by Brazilian investors and Portugal Telecom), and GVT.