Before the plane starts its descent
Do this in your kitchen, not in seat 24C. The QR email is the product. On iPhone, Settings, Cellular, Add eSIM, Use QR Code. On Android, Settings, Network and internet or Connections, SIMs, Add eSIM, and scan. Label the line Vietnam. Leave your home SIM as the line for calls and texts. If the camera will not scan, the same email includes the SM-DP+ address and, on Android, the LPA string for manual entry. Stay on Wi-Fi until the profile says it is installed.
Turn the Vietnam line’s mobile data off until you are in Vietnam. Validity starts on the first Viettel connection inside the country, so there is no benefit to forcing a registration over a foreign network, and a local profile is not meant to roam abroad.
What the T2 hall is actually like
International flights use Terminal T2. You clear passport control, collect bags, and walk through customs into the public arrivals hall. That is the noisy room with currency counters, SIM desks, and people holding name signs. Viettel says its official kiosk is in that T2 arrival hall, immediately after passport control. The branding is red and white. If you buy there, staff register the SIM against your passport. That is normal for a Vietnamese SIM sold in person. It is also the queue this eSIM is meant to skip.
Noi Bai’s own site documents free Wi-Fi in the seating areas of the domestic and international terminals. The network name they publish is “@Airport Free Wifi - Goldsun”. After you join it, a browser page asks you to press Connect to the Internet. The airport has also said the expanded part of T2 was still being fitted out with that system, so a dead captive portal is not a personal failure. Use the Wi-Fi only if you still need to open the QR email. Then switch to the eSIM.
Switch lines, then call the car
- Disable airplane mode only when you want the line to register. That registration is what starts the plan clock.
- Set mobile data to Vietnam. Turn mobile data on. Set data roaming to off.
- Give it five to ten minutes. Signal in the hall can be crowded right after a bank of wide-body arrivals. Stepping toward the exit doors often helps more than toggling airplane mode ten times.
- Open Grab. Follow the airport signs to the ride-hailing and taxi curb. Ignore offers shouted in the hall. The in-app pin is the price you agreed to.
Noi Bai sits well north of the city, on the order of 30 kilometers from Hoan Kiem. A Grab or taxi into the Old Quarter commonly takes 45 to 90 minutes. The Nhật Tân bridge corridor is the usual path. At night the same road is faster. In rain or at the end of a holiday weekend, budget the long end. City buses also run toward central Hanoi, but they are the option that disappears first on a late arrival. If your flight is after midnight, assume the bus is not your plan and that a SIM counter may already be dark. The eSIM does not care what time the desk closes.
After you are in the city
Hanoi itself is straightforward on Viettel: the Old Quarter, the French Quarter, and Tay Ho are ordinary urban coverage. The interesting test of this eSIM is the trip you probably bought it for, toward Ninh Binh, Ha Long, Sapa, or the Ha Giang loop. Those roads are why a local Viettel line is different from a roaming eSIM that sits on Vinaphone. Read the Hanoi coverage page for what the national measurement reports actually say, and the mountain pages for where the signal thins out. Maps and Grab for a city day sit comfortably inside 5GB. The allowance resets at 23:59 Vietnam time. When it is gone, data stops for the rest of that day. There is no slowed-down unlimited tier on this plan.
If you have bars and no internet, do not delete the eSIM. Deleting it can consume the one-time profile. Use the no-data checklist, or write to contact@esimforvietnam.com or Telegram @AIdePaul.