Viettel
Vietnam
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Viettel is Vietnam's largest mobile network operator and cuts out the middleman by selling directly to visitors. You can order eSIM packages online before travel or pick up physical SIM cards at airport counters in Hanoi, Ho Chi Minh City, Da Nang, and Phu Quoc, getting instant local coverage.
Buying from the operator means you're on the native network without reseller markups, which often translates to better rates on data and voice plans for your stay.