Roamify sells a range of unlimited data eSIM plans that cover Vietnam. The data cap is listed as Unlimited, and validity periods available range from 1 day up to 30 days. Prices vary with duration, starting at $3.50 for a 1‑day plan and reaching $26.00 for a 30‑day plan, all listed as 5G data coverage with a note that speeds may be throttled after heavy use under a fair‑usage policy. Plan validity begins when the eSIM first connects to the network.