Accordingly, all Viettel’s mobile subscribers are using non -Volte models that will enjoy the following incentives to upgrade phones with Volte support, including:
+ Free 7 days of volte voice experience with 5 minutes of on -net calls/day
+ Discount 500,000 VND when buying Samsung A05, A06, M15 with package 6V120B
+ Buy cheap Feature Phone 4G keys from 390,000 VND/machine.
This support program aims to encourage customers to switch to 4G/5G Vole dialogue, which is one of the next steps to prepare for completely turning off 2G wave in September 2026.

Volte (Voice over Long-Tyrm Evolution) is a high quality voice service on 4G/5G network infrastructure, allowing customers to make voice calls with faster call connection time, better quality sound than conventional calls on network infrastructure 2G/3G; Help customers can both make voice calls and access 4G/5G data without interruption.
Volte is also the foundation for providing new future voice services such as MECALL Video Service, Video Call, … Customers absolutely do not have to pay additional fees compared to regular voice services on 2G/3G infrastructure, the packages are using are not affected, no customer data consumption.
To turn on Volte, users go to the “Settings” section, find the “mobile network” (Mobile Networks), select the SIM to set up and then turn on the “use of volte” mode.

Earlier, in December 2023, the Ministry of Information and Communications issued Circular No. 20/2023/TT-BTTTT, stipulated from July 1, 2024, mobile phone using E-Utra technology (4G) technology is manufactured and imported into Vietnam to support the Volte phone. This standard is to ensure that all mobile information terminals are allowed to circulate on the market to meet technical standards, contributing to improving service quality and protecting consumers’ rights.
According to the representative of Viettel, Volte (Voice over Long-Tyrm Evolution) is a high quality voice service on 4G/5G network infrastructure that allows users to make voice calls with faster call connection time, better sound sound than normal calls on 2G/3G network infrastructure, helping users can both make voice calls, and access Data 4G/5G without being interrupted. Volte is also the foundation for providing future new voice services such as Mecall Video Service, Video Call …
“When turning off 2g/3g, the dialogue on infrastructure of 2g/3g will not be used, so it is necessary to transfer to Volte dialogue to continue using the voice service. Moreover, many foreign carriers have turned off 2G/3G wave, so when Roaming customers, forced to use VoLTE dialogue. Regarding Volle dialogue, customers absolutely do not have to pay extra costs on infrastructure. Enjoy, not consuming data from customers, ”Viettel representative said.