Viettel Migrates 100M Subscribers to Cloud-Native Charging, Zero Downtime
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HANOI – October 27, 2026 -- Viettel High Technology Industries Corporation has migrated more than 100 million subscribers and about 5,000 tariff plans at Viettel, Vietnam's largest mobile operator, to its in-house cloud-native charging system vOCS 4.0. The three-month cutover ran on a live national network with no service disruption.
Phased cutover with instant rollback limits the risk of replacing a charging system
Replacing a charging system is one of the riskiest projects an operator can undertake, and many operators therefore stay on legacy platforms. Viettel High Tech, part of Viettel Group, reduced the risk through real-time data synchronization, parallel running and a phased cutover, with instant rollback at every stage.