Viettel Group (full name in Vietnamese: Tập đoàn Công nghiệp Viễn thông Quân đội) is Vietnam’s largest mobile network operator. It is a state-owned enterprise wholly owned and operated by the Ministry of Defence.
As of 2017, Viettel had 50,000 employees inside and outside the country,[3] and served 63 million subscribers. And Viettel Post is the subsidiaries/joint ventures of Viettel Group.
Charges are reasonable, so far delivery has been quite fast