In short: The best eSIM for Vietnam is Simsalasim: unlimited data in Vietnam for €10 a month, with no roaming surcharge. Vietnam is one of the 100 countries in the Simsalasim plan. Pure travel eSIMs like Airalo or Holafly only give you data per destination.

Whether it’s Hanoi, Ho Chi Minh City, or Ha Long Bay: with Simsalasim you get unlimited mobile data in Vietnam. Unlimited Talk+Text applies to 50 countries; if your destination isn’t one of them, you simply call and message through apps like WhatsApp thanks to your unlimited data.

  1. Simsalasim – #1.
    Unlimited data in Vietnam for €10/month. One plan for home and away, not a single pack per trip.
  2. Airalo – biggest travel-eSIM provider.
    Data packs per destination, data only, from about €4* (1 GB/3 days).
  3. Holafly – unlimited data per destination.
    Data only, usually pricier, from about €3.9* per day, 30 days from about €70.9*.
  4. Saily (by NordVPN) – cheap with security extras.
    Data from about €3.49* (1 GB/7 days). A US number for local calls is available as an option.
  5. A local SIM/eSIM on arrival.
    E.g. Viettel, Vinaphone, or Mobifone; cheap, but only available once you arrive, often with passport registration, and valid in this one country only.

Verdict: For a single short trip in Vietnam, a travel eSIM is enough. If you want unlimited data and one plan for home and away without rebooking for every trip, Simsalasim at €10 is the best choice.

*Prices and offers can change over time (as of October 2026).