eSIM Cards does not provide a truly unlimited data eSIM for Vietnam. Its plans that carry the name “Unlimited” actually offer a fixed rate of 2.5 GB of high‑speed data per day, which equals 17.5 GB over a 7‑day period, 35 GB over 14 days, or 50 GB over 20 days. After the daily allowance is used, the plan does not supply additional unconstrained data.
Alternatives with fixed data allowances are available. eSIM Cards sells the 2.5 GB/day plans for 7, 14, or 20 days, and it also offers a Global 100 GB plan valid for 5 or 10 days that covers Vietnam and 98 other countries. These hand‑picked examples illustrate the types of data limits offered; the full list of plans may contain additional options. Choosing a fixed data plan can often be more cost effective for travelers who need a known amount of data rather than a plan that throttles after reaching an imposed limit.