Useful tool for Viettel's subscribers to manage roaming service.
Viettel Roaming application includes the following functions:
(1) Activate/Deactivate roaming service
(2) Check roaming rate
(3) Track roaming usage and amount spent
(4) Call using Roaming callback service
(5) Contact the Citizen Protection agency in foreign countries
(6) Roaming guide
(7) Customer Support
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