The Military Industry and Telecoms Group (Vietnamese: Tập đoàn Công nghiệp - Viễn thông Quân đội, lit.

[6] In December 1992, SIGELCO applied for the State's permission for transforming into an Electronics and Communication Equipment Company under the management of the Signal Corps.

On 15 October 2000, Vietel officially piloted VoIP service for Hanoi - Ho Chi Minh City route with "178 - your saving code" campaign.

They continued to expand the service to 62 more provinces (Hanoi and Ha Tay was separate at that time) and broke even only 9 months later.

[15] In March 2003, Viettel offered long-distance public switched telephone network (PSTN) call service in Hanoi and Ho Chi Minh City.

[13] On 6 April 2005, the company changed its name to Military Telecommunications Corporation under the management of MOD and its subordinate Centers and Factories were transformed into Subsidiaries.

Natcom was also the only telco that owned the unique international Internet port in Haiti via the 10 Gbit/s cable line to Bahamas and the United States.

[35] In 2013, at telecommunications and IT forums, the Group's leader declared Viettel's strategic transferral from a mobile network operator to a service provider.

[49] In November, 2016, Viettel was officially granted the license to supply 4G services in Vietnam, declaring that they were able to produce infrastructure equipment for telecommunications network.

[63] In April 2019, Viettel completed the integration of the first 5G infrastructure in Hoan Kiem Lake area (Hanoi) and triumphantly tested broadcasting 5G service on the frequency bands licensed by the Ministry of Information and Communications.

Le Dang Dung, Viettel's Acting President and Chief Executive Officer, committed their restless efforts in accompanying the Government to develop a digital society as well as e-Government system in Vietnam.

[67] At the end of the month, Viettel declared their intention to turn Mocha into a super application for music, films, videos, news, games, etc.

[69] In September 2019, Viettel declared that it would broadcast 5G network and deploy Internet of Things (IoT) infrastructure in Ho Chi Minh City.

According to the Global System for Mobile Communications Association (GSMA), Viettel is the only Vietnamese enterprise to rank among the first 50 network operators to successfully deploy 5G technology in the world.

[73] On 27 October 2023, Viettel introduced its first domestically-developed 5G DFE chip, claiming that the product has an equivalent complexity to the Apple A7 SoC.

[75] Viettel has developed telecommunication services in Laos, Cambodia, Haiti, Mozambique, Peru, Tanzania, Timor-Leste, Cameroon, Burundi and Myanmar.

Following the 2021 Myanmar coup d'état and subsequent unrest, it was revealed that Viettel actively does business and assists the State Administration Council in cracking down protesters throughout Mytel, a joint-venture that owned by Viettel and the Tatmadaw, as for the result, its Burmese branch was sanctioned by the United States Treasury Department with assets frozen.

[103][104] Viettel has also been embroiled, indirectly, for having business ties with the Lebanese diversified investment holdings company M1 Group (owned by the Mikati family's Taha and Najib), a supporter of authoritarian regimes in the Middle East, throughout Mytel.

[106] In June 2015, Bui Quang Huy, a representative of the Viettel Group in the United States, negotiated with the company EO Imaging to purchase missile tracking equipment using video technology.

On March 10, 2016, Bui Quang Huy proactively contacted a US company called Sandia Technical Supply LLC to start business negotiations.

On May 9 and 10, 2016, the two sides signed documents, and Viettel's representative transferred a deposit of $20,000 to Sandia even though there was no export license to Vietnam.

[110][111] The official trial of this case in September 2017 concluded that Bui Quang Huy had pleaded guilty to illegal smuggling.

Viettel's internal investigation sent to the US FCC concluded that Bui Quang Huy's acts of smuggling military equipment were entirely his own initiative and not directed by the company.