In short: the best eSIM for Vietnam is one that connects to Viettel's network (which has the best coverage, crucial in areas like Sapa or Ha Giang), gives you between 10 and 20 GB with 30 days of validity, and activates without passport registration. Install it before leaving home and you'll have data from the moment you land at Noi Bai terminal, without queues or paperwork.
If you're organizing a trip to Vietnam, you probably already know that buying a local SIM at Hanoi or Ho Chi Minh airport involves queuing, showing your passport, and explaining yourself in English to the vendor while the rest of your group waits. eSIM solves that: you buy it from your couch, install it, and turn it on the moment your plane touches down. This guide gets straight to the point: which operator is best, how many GB you need depending on your itinerary, and what mistakes most travelers make when choosing.
What is the best eSIM for Vietnam?
The best eSIM for Vietnam is one that relies on the Viettel network, the operator with the most antennas and best rural coverage. It's the go-to for mountainous areas like Sapa, Ha Giang, or Mu Cang Chai, where other operators lose signal as soon as the road starts winding. For most itineraries (two or three weeks visiting Hanoi, Ninh Binh, Hoi An, Da Nang, and Ho Chi Minh), a 10-15 GB plan valid for 30 days is sufficient without running out of data halfway through your trip.
Vietnam is, by nature, a long-travel destination. People don't go for three days: they go for three weeks, and that changes the purchasing criteria. It's better to look at total gigabytes and validity rather than the price of a short plan, because buying two or three successive eSIMs during your trip is more expensive (and more inconvenient) than one well-sized one from the start. An eSIM that you install before leaving and works as soon as you land in Noi Bai saves you exactly that: the queue to buy a physical SIM with passport in hand.
Operators and real coverage by region
In Vietnam, there are three major mobile networks, and the eSIM you buy will connect to one of them. Knowing them helps you understand what real coverage you'll have, not just what marketing promises:
- Viettel: The network with the most antennas and best rural coverage. It's the benchmark for mountainous areas like Sapa, Ha Giang, or Mu Cang Chai, where other operators lose signal as soon as the road starts to wind.
- Vinaphone: Very good in cities and tourist centers, owned by the state group VNPT. Solid in Hanoi, Hoi An, and the coast.
- Mobifone: Strong in large cities, somewhat less present inland and on mountain roads.
In Hanoi, Ho Chi Minh, Da Nang, or Hoi An, you'll have 4G and even 5G without any problem; bottlenecks appear on overnight bus journeys in the north, during trekking through Sapa's rice paddies, or on specific stretches of the Ha Giang Loop road, where you might go 20-30 minutes without a signal bar. In Ha Long Bay, the signal usually holds near the coast but cuts out as soon as the boat goes deep into the limestone islets: if you're doing a day cruise, download maps and reservations before boarding. That's why, if you're going to travel extensively in the mountainous north, an eSIM that prioritizes the Viettel network is the safest bet. Our Vietnam eSIM relies on the local networks with the widest reach so you have signal even outside the capitals.
A nuance often overlooked: in the Mekong Delta (Can Tho, Ben Tre), coverage is good in the villages but drops in the narrow channels where boats navigate. If you're going on a floating market excursion, don't count on data during that hour and a half journey.
How many GB do you need for Vietnam?
It depends on how you travel, but Vietnam invites a lot of sharing: photos of terraced rice fields, videos of Ha Long Bay, and constant maps so you don't get lost in the motorbike traffic of Hanoi or Ho Chi Minh, which is among the most chaotic in Southeast Asia and makes you check Google Maps every two minutes. A direct answer: for a two-week trip with normal use (maps, social media, WhatsApp, and some video), estimate between 8 and 15 GB. If you stream a lot or share data with your laptop (hotspot), go up to 20 GB or look for a plan with generous data.
These figures are indicative and serve as a guide:
| Traveler Profile | Approx. daily usage | GB for 15 days |
|---|---|---|
| Light (maps, chat) | ~0.3 GB | 5 GB |
| Normal (social media, photos) | ~0.7 GB | 10-12 GB |
| Intense (video, hotspot) | ~1.5 GB | 20 GB or more |
A little-known trick: if you're staying in homestays in Sapa or Ninh Binh, the Wi-Fi is usually weak (sometimes only one bar for the entire shared house among guests), so don't count on it for long video calls and save those moments for when you have good mobile data coverage. If you want to refine the calculation according to your exact itinerary, rely on our guide on how to save eSIM data while traveling, especially useful on long overnight bus journeys where the signal comes and goes.
Comparison: what to look for before paying
Not all Vietnam eSIMs are created equal. Beyond the brand, look at four things before paying: the network it connects to, whether the data is sufficient for the entire trip, the validity in days, and whether there's real support in English in case something goes wrong at three in the morning Vietnam time. Here's the quick checklist:
- Coverage: It should use Viettel or Vinaphone, especially if you're going outside major cities.
- Data and validity: The GBs should last your entire trip, not just the first week.
- Real price: Compare by GB and by day of validity, not by the "from X euros" claim on the first screen.
- Support: Having help in English prevents you from being without internet halfway through your trip and not knowing who to contact.
Regarding the price point: at PuraSIM, we prefer not to give you a specific figure here, because rates change, and an old figure in a blog is worse than none at all. What you can do, however, is compare the cost per GB between plans, which is the metric that truly matters when deciding between two similar options.
If you're comparing Vietnam with other destinations on your Asian route, or if your itinerary crosses borders, also review the difference between a physical international chip and an eSIM: for a multi-week trip to Vietnam, an eSIM almost always wins because you don't have to remove or store your original SIM.
Mistakes and myths that almost no one tells you
There are several myths that are repeated in traveler forums and should be debunked before buying:
"My Spanish operator's roaming will be enough." Outside the European Union, roaming is not included, and the cost skyrockets as soon as you activate data: it can be the most expensive surprise of the entire trip if you don't deactivate it in time. Vietnam is not part of any cheap roaming agreement with Spain, so if you activate data with your usual rate, you will find a bill when you get home. If you are not sure how this works, you should first understand what data roaming is and why it changes so much outside the EU.
"Unlimited plans are always the best option." Be wary of very cheap "unlimited" plans: they almost always drastically reduce speed after consuming a few GB per day, so in practice, you end up browsing at a snail's pace for the last few hours of the day. Always read the fine print about what happens when you exceed the threshold.
"I need a special mobile to use eSIM." No, most smartphones from recent years (iPhone from XS, Samsung's mid-to-high range, Google Pixel) come with eSIM built-in. What you do need to check is that your mobile is unlocked: if you bought it financed with a Spanish operator and it is still associated with that company, it may block the installation of another eSIM.
"It doesn't matter which eSIM I buy, they all use the same network." This is not true: each provider negotiates agreements with different operators, and that explains why a travel companion with another eSIM might lose signal in a place where yours works fine. It's not magic or luck; it's simply which local network each eSIM connects to.
A detail many people overlook: if you're going to use payment apps or banking while traveling, consider what traffic you expose on public Wi-Fi networks in hostels and cafes. There's no need to be paranoid, but it's a good time to consider if you're interested in using a VPN alongside your eSIM when connecting from shared Wi-Fi, especially in tourist areas where dozens of guests use the accommodation's router at once.
Vietnam and Cambodia in one trip
Many travelers combine Vietnam and Cambodia in the same itinerary, as the Angkor temples are just a short flight from Ho Chi Minh or Hanoi. If this is your case, you have two options: a separate eSIM for Vietnam and Cambodia, or a Southeast Asia regional plan that covers both countries with a single QR. The second option is more convenient because you don't have to change eSIMs when crossing the border or keep track of which one is active.
The practical rule we apply ourselves: if you spend more than 4-5 days in each country, a regional plan is worth it for convenience, even if it's slightly more expensive per GB. If you only cross into Cambodia to see Angkor Wat for a couple of days, there's no need to complicate things: use your Vietnam eSIM for the main part of the trip and manage those two days with hotel Wi-Fi, which in Siem Reap is usually reasonably good in tourist areas.
Before you go, it's a good idea to review the difference between eSIM and traditional roaming to be clear on what to activate and when, especially if your trip involves segments both inside and outside the European Union.
How to install and activate it
Installing an eSIM for Vietnam takes minutes and should be done before leaving home, calmly and with good Wi-Fi, not in the departure lounge with 12% battery. You buy the plan, receive a QR by email, scan it from your phone's settings, and the eSIM is saved as another line. When you land in Vietnam, you just have to activate the data for that line and you'll be connected in just 1 minute.
A tip to avoid surprises: leave the eSIM installed but with data off until you arrive, so you don't waste validity time (some plans start counting days from the first connection to a Vietnamese network, not from purchase). On the plane, as soon as you land and before getting off the stairs, turn on the eSIM's mobile data and you're good to go, no need for airport Wi-Fi or finding a counter. If this is your first time with this system, follow the step-by-step guide on how to install an eSIM, which applies to both iPhone and Android, and if you have doubts about what an eSIM is exactly compared to a physical SIM, first clarify the concept in what is a virtual eSIM.
Frequently asked questions
What is the best eSIM for Vietnam?
The one that relies on Viettel's network (which has the best coverage, even in rural areas of the north) and gives you enough GB for the entire trip. For two or three weeks, a 10-15 GB plan with 30 days of validity covers the classic north-to-south itinerary without running out of data halfway through your trip.
Does an eSIM work throughout Vietnam?
Yes. Travel eSIMs connect to local operators (Viettel, Vinaphone, Mobifone), so you have coverage in cities, beaches, and tourist areas. In very remote mountain treks or on sections of the Ha Giang Loop, the signal may fail, which is also normal with a local Vietnamese SIM.
How many GB do I need for 15 days in Vietnam?
For normal use of maps, social media, WhatsApp, and some video, between 8 and 15 GB is sufficient for two weeks. If you do a lot of streaming or share internet with your laptop via hotspot, go up to 20 GB or more to be safe.
Can I use the same eSIM in Vietnam and Cambodia?
Only if you purchase a Southeast Asia regional plan that includes both countries. A Vietnam-specific eSIM only works in Vietnam. If you combine both destinations for more than a few days in each, a regional plan saves you from changing eSIMs when crossing the land border or flying to Siem Reap.
Do I need to register the eSIM with my passport?
No. One of the advantages of a travel eSIM is that you buy it online and it activates without paperwork or passport registration, unlike local SIMs in Vietnam which require identification at the point of sale. You scan the QR and you're ready.
Can I use my Spanish roaming instead of an eSIM in Vietnam?
Technically yes, but Vietnam is outside the European Union, so roaming is not included in your usual rate, and the cost skyrockets as soon as you activate data. For a trip longer than a couple of days, a Vietnam eSIM is much more cost-effective than relying on roaming.
What happens if I run out of data halfway through my trip?
Normally you can buy an additional plan or top up from the same app or provider panel, without having to reinstall anything or look for a physical point of sale. This is one of the advantages over a local SIM: topping up can be managed online at any time.
Conclusion
The best eSIM for Vietnam prioritizes Viettel coverage, sufficient GB for a long trip, and a clear price without "unlimited" traps. Install it before you leave and you'll arrive in Hanoi with internet from the first minute, without queues or passport hassles. With PuraSim's Vietnam eSIM, you connect in 1 minute upon landing and have Spanish support if any questions arise during your trip, from Sapa to the Mekong Delta.
