Roaming4You does not provide a true unlimited data eSIM for Vietnam. All of its Vietnam plans are fixed‑data bundles that give 1GB of high‑speed data per day, with validity periods ranging from 1 day to 30 days. For example, the “Vietnam Unlimited Data – 30 days” plan offers 1GB/day for 30 days, while the “Vietnam Unlimited Data – 15 days” plan gives 1GB/day for 15 days. These are fixed data plans, not unlimited plans, and the data allowance is capped at the stated amount. Choosing a fixed data plan can be more cost‑effective unless a traveler expects to use far more data than the bundle provides.