eSIM for Vietnam: cheap data from north to south
An eSIM for Vietnam keeps you connected from Hanoi to Ho Chi Minh City and Halong Bay. On a tour through the country, a reliable connection is worth its weight in gold for booking transport and finding your way. This guide explains everything with tables, tips and an FAQ.
Do I need an eSIM in Vietnam?
Yes, usually you do. Vietnam is not an EU country, so your home data is billed there at the pricey outside-Europe rate. An eSIM gives you a generous, fixed volume at a price you know in advance, while your home number stays active for calls and codes.
Outside the EU: when you arrive, turn off the mobile data on your home SIM card and use only the eSIM, to avoid expensive roaming.
More details in eSIM or roaming.
How much data do you need in Vietnam?
| Type of traveller | Usage | Recommended data |
|---|---|---|
| Light (weekend) | Maps, WhatsApp, occasional social media | 1 to 3 GB |
| Average (week) | Social media, sharing photos, navigation | 5 GB |
| Intensive (1 to 2 weeks) | Lots of navigation, videos, translation | 10 GB |
| Long trip or sharing | Tethering, working, family | 20 GB or more |
For a tour of several weeks you are better off counting on 10 GB or more. Our guide how much data do you need on a trip helps you choose.
eSIM or roaming: which is cheaper in Vietnam?
| roaming with your home carrier (outside the EU) | eSIM for Vietnam | |
|---|---|---|
| Cost | High rate per MB, adds up fast | Fixed price in advance, from 1.99 euros |
| Risk of surprises | High | None |
| Data volume | Limited and expensive | You choose yourself |
| Your home number | Stays active | Stays active (dual SIM) |
For Vietnam the eSIM almost always wins on price and peace of mind.
How is the coverage in Vietnam?
| Area | Coverage |
|---|---|
| Major cities (Hanoi, Ho Chi Minh City) | Excellent, 4G |
| Tourist spots (Hoi An, Da Nang) | Very good |
| Halong Bay | Good |
| Northern mountains (Sapa) | Variable |
In the cities and tourist areas you are well covered, in the remote mountains it varies.
Installing an eSIM for Vietnam
Install at home over Wi-Fi, before you leave. After your purchase you receive a QR code and activation link by email.
- On your phone, open the settings for mobile data and choose Add eSIM.
- Scan the QR code, or tap the activation link in the email.
- When you arrive, turn on data roaming for the eSIM line.
Full instructions in installing an eSIM on iPhone and Android.
Installing is not the same as activating. Validity usually only starts with your first connection in Vietnam. Also check whether your device is suitable via phones with eSIM.
Keeping your home number
Thanks to dual SIM your home number stays reachable for calls and banking codes, while the eSIM handles your data. Outside the EU, turn off the data on your home SIM. More in dual SIM with eSIM.
Tips to save data in Vietnam
- Download offline maps and your travel route before you leave.
- Use an offline translation app.
- Set cloud backups and updates to Wi-Fi only.
- Turn off autoplay video in apps.
- Do large downloads over the Wi-Fi at your accommodation.
Frequently asked questions about an eSIM in Vietnam
### Is an eSIM handy for a tour?
Yes, you do not have to look for a local SIM card in any country: everything is ready before you leave.
When does the validity period start?
With most eSIMs only when you first connect to the local network, not when you install.
What if I run out of data?
With many eSIMs you can easily top up without installing a new one.
Do I have to turn off the data on my home SIM card?
Yes, outside the EU it is strongly recommended to avoid expensive roaming.
Conclusion
Because Vietnam is outside the EU, an eSIM saves you the most here, with a fixed price and no surprises, while your home number keeps working. Count on 10 GB or more for a tour. Install at home over Wi-Fi, turn off your home data, activate on arrival. At esimzu you pay easily by card, receive your eSIM by email right away and benefit from a lowest-price guarantee.