During the four.0 period, Viettel's social accountability is standing side by facet with various models and businesses to create chances to create a breakthrough technology, participating for your prosperous Vietnam.2014: Nhà cung c?p d?ch v? vi?n thông t?t nh?t th? gi?i t?i các th? tr??ng ?ang phát tri?n - WCAHalotel implies "Halo" and "Teleco