HANOI -- Viettel Group, Vietnam's largest mobile telecom operator, intends to use its own core technology to build a fifth-generation network as the state-owned company prepares to launch ultrahigh-speed wireless services by 2021.
"Viettel has invested millions of dollars to develop 5G chips and is working on developing devices with 5G chips," a company representative told the Nikkei Asian Review on Monday.
