Within the 4.0 era, Viettel's social duty is standing aspect by side with several models and organizations to develop possibilities to create a breakthrough technology, participating for your prosperous Vietnam.Gi?y phép b?u chính V?n ba?n xa?c nh?n thông ba?o hoa?t ??ng b?u chi?nh THÔNG TIN LIÊN H?Gói c??c details Gói tho?i/sms Mua sim s? C