Airtel India
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Airtel's international roaming packs reach 184 countries, including Vietnam, and you can download the eSIM before you leave India rather than waiting for arrival. The carrier offers straightforward data and calling bundles tailored to different trip lengths, with transparent pricing built into your home Indian account.
This works best if you're an Airtel customer in India or can easily get an Indian number. Compared to dedicated eSIM providers, Airtel's integration means all billing stays on your existing account, and you won't lose your home number while traveling.