MeSIM does not provide a truly unlimited data eSIM for Vietnam because every plan listed has a specific data cap in the Data cap column. The term “unlimited” in the plan names only indicates that high‑speed data is available until the advertised amount is used; after that, the speed is reduced (typically to 384 kbps). If a traveler wants large, fixed amounts of data, MeSIM offers several high‑cap plans. For example, the Vietnam 30‑day unlimited eSIM gives 5GB of high‑speed data per day for $16.49, and the Vietnam 15‑day unlimited eSIM provides 7GB per day for $7.99. These are fixed data plans that can be more cost‑effective than buying more data on a pay‑as‑you‑go basis for heavy‑usage travelers.