In Vietnam, being connected is not a whim: you need it to call a Grab at eleven at night in Hanoi, to show the taxi driver the address written in Vietnamese, or to pay with a QR code at a bún chả stall. The good news is that internet in Vietnam is fast and cheap. The bad news is that there are five ways to get it, and four of them have fine print. Here I compare them all so you can have mobile data from minute one, with no surprises on your bill or queues at the airport.
What internet in Vietnam is really like
In Vietnam, you have five ways to connect: roaming (the most expensive), public Wi-Fi (free but unreliable outside the hotel), pocket Wi-Fi (rental router with a deposit), local SIM (cheap but requires a passport and beware at the airport), and eSIM, which activates before you fly and is the most practical option.
Vietnam invested heavily in mobile and little in fiber: the result is a country where 4G reaches places without asphalt. The three operators—Viettel, Vinaphone, and Mobifone—cover almost the entire population, 5G is already active in major cities, and everyday speeds are around 15–50 Mbps, more than enough for maps, messaging, and video.
The problem for tourists is never the network: it's access to the network. Your European card doesn't work with local rates, buying a SIM involves paperwork, and at the airport, there are people waiting for you to arrive tired from your flight. That's why it's best to arrive connected from the plane and not improvise at the terminal.
| Option | Estimated price (2-week trip) | Advantage | Disadvantage |
|---|---|---|---|
| Roaming with your home operator | From €25 with a bundle; €6–12/MB without a bundle | Zero hassle, same number | Highest risk of bill shock |
| Public / hotel Wi-Fi | €0 | Free and widely available | Not available on the street or on the road |
| Pocket Wi-Fi | $4–10/day + $50–100 deposit | Share with multiple devices | Pickup, return, and deposit |
| Vietnamese local SIM | 60,000–200,000 VND (≈ €2–8) | Cheapest option | Passport, queue, and inflated prices |
| Travel eSIM | From ~€10 depending on data and days | Activates before flying | Requires compatible phone |
Roaming with your Spanish operator: fast, convenient, and very expensive
What many people do by inertia: land, turn on their mobile, and let their Spanish card connect to Viettel. It works, yes; the price is the problem. Vietnam is in Zone 3 for almost all Spanish operators, outside the European "roaming like at home" zone. Without contracting anything, standard rates are around €6/MB with Vodafone and go up to €12/MB with Movistar. Per megabyte. An Instagram video can cost you more than dinner.
International bundles soften the blow, but they are still expensive: 20 GB for €25 for 7 days in the best case, or 150 MB for about €60 in the worst. And they all share the same flaw: if you forget to activate it, if it expires mid-trip, or if you go over, you revert to the standard rate without warning.
- Check Vietnam's zone on your operator's website before flying.
- Activate the roaming data spending limit if allowed.
- Deactivate mobile data on the plane if you're not using a bundle.
I've seen too many travelers return with a three-figure bill for two weeks of maps and WhatsApp. I break down the detailed numbers in how much international roaming costs and in the comparison of eSIM vs. roaming.
Public and hotel Wi-Fi: it's everywhere, but it's not a plan
Here comes the pleasant surprise: Vietnam has one of the most generous free Wi-Fi cultures in the world. Cafes, €12 hotels, hostels, restaurants, airports, and even some buses offer Wi-Fi without asking for more than a purchase. In Hanoi or Ho Chi Minh, you can spend the day jumping from network to network; the password is usually printed on the receipt.
The problem begins when you leave that environment. Vietnamese Wi-Fi is abundant but inconsistent: overloaded home routers, brief power outages, networks shared by 40 people in a hostel at nine at night. And, above all, it doesn't exist right where you need it most:
- When leaving the airport, when you need to order a Grab and confirm the driver.
- On a night bus to Hue or the train to Sapa.
- On a motorbike through the Hai Van Pass or the Ha Giang loop, following the map.
- When the hotel is on a street with no number and you need to call.
Add the security risk: on open networks, avoid logging into your bank. My conclusion is simple: Wi-Fi is a great complement to save data at the hotel, but you cannot rely on Wi-Fi as your only connection in Vietnam.
Pocket Wi-Fi: the rental router
Pocket Wi-Fi is a small 4G router with a battery that you rent for your trip and generates its own private network. You pick it up at the airport or have it sent to your hotel, turn it on, and connect up to 5–10 devices. For certain profiles, it makes sense: a family of four or someone who needs to connect a laptop, tablet, and mobile simultaneously.
Prices in Vietnam range from $4 to $10 per day, with deposits of $50–100 blocked on your card until you return the device. That's the catch: in two weeks, $60–140 is significantly more than any other option in the country.
If you are traveling as two people or less, pocket Wi-Fi almost never pays off: you pay for an extra device, for its battery, and for the fear of losing it, when the mobile you already carry does exactly the same thing.
The real drawbacks: you have to pick it up and return it at specific times, the battery lasts 6–10 hours (less than your mobile), if the group splits up, only one person has internet, and if it falls into the water in Ha Long, you forfeit the deposit. It is, literally, one more device to carry. I compare it in eSIM vs. pocket Wi-Fi.
Vietnamese local SIM: Viettel, Vinaphone, and Mobifone
The local SIM is the option with the best price-to-data ratio in the country, it must be acknowledged. A typical tourist package costs between 60,000 and 200,000 dong (about €2–8) and includes generous data for 7, 15, or 30 days: Vinaphone's tourist SIM, for example, sells for about 199,000 VND with 1 GB per day plus minutes and SMS. Many plans have high daily quotas or are "unlimited" with a speed limit after a certain threshold.
The choice of operator does matter, and quite a lot:
- Viettel: the giant, with more than half the market and the best rural and mountain coverage. If you're going to Ha Giang or Sapa, this is the one you want.
- Vinaphone: very fast 5G in the city; somewhat weaker in remote areas.
- Mobifone: solid in major cities and in the south, less present in the rural north.
As a rule, in Vietnam, rural coverage takes precedence over peak speed: I prefer stable 20 Mbps on a mountain pass to 500 Mbps in the center of Hanoi. However, the local SIM has three costs that don't appear in the price: the queue, the paperwork, and the risk of being ripped off. You can find the long analysis in eSIM vs. local SIM.
Airport price scams and passport registration
Vietnam requires all SIM cards to be registered with an identification document. For a foreigner, this means handing over your passport, having it scanned, and having the card registered in your name. It's legal and routine, but it implies two things: you cannot buy an anonymous SIM at a kiosk (if they sell it activated "without papers", it's usually registered in an unknown name and can be deactivated in days) and you need your passport handy as soon as you land.
The second problem is the price. At the arrival counters of Noi Bai (Hanoi) and Tan Son Nhat (Ho Chi Minh), tourist packages are sold 30–50% more expensive than in an official store downtown. Travelers' complaints are always the same:
- Charges in dollars or euros with a terrible exchange rate.
- They "upgrade" you to a more expensive plan you didn't ask for.
- They sell you 10 GB that expire in 3 days.
- "Activation" fees that appear out of nowhere.
My basic rule: the official price is printed on the box. Ask to see the sealed package, pay in dong, check your mobile for the data and days remaining before you leave, and be suspicious of any vendor who rushes you. If this already sounds like a hassle, that's precisely why the next option exists.
The eSIM: my recommendation for 90% of travelers
An eSIM is a digital card that is downloaded to your mobile: no plastic, no tray, no clip. You buy the plan, scan a QR code, a profile is installed, and when you land in Vietnam, your phone automatically connects to the local network. Your Spanish number remains active on the physical SIM, so you receive bank SMS while browsing with local data. I explain it without technical jargon in what an eSIM is.
For Vietnam, it solves all the friction points we've just seen:
- No queues: you leave the plane with data, without going to any counter.
- No physical passport or photocopies floating around.
- No inflated prices: the price you see is what you pay, in euros and from home.
- No taking out your Spanish SIM or risking losing it in a hostel.
- The same networks (Viettel and company) as the local SIM.
The only requirement is that your mobile is compatible: almost all iPhones since the XS, Pixels since the 3, and recent high-end and mid-range Samsung, Xiaomi, or Motorola devices are. The best thing, for me, is being able to activate it from home at your leisure and land without thinking about anything. You have the step-by-step guide in the eSIM guide for Vietnam.
4G and 5G Coverage: Hanoi, Ho Chi Minh, Ha Long, Sapa, and the countryside
No matter which option you choose: they all rely on the same antennas. This is what you'll find on the ground.
Hanoi and Ho Chi Minh: excellent coverage. 5G with all three operators and solid 4G even in the alleys of the Old Quarter. Here you won't have any problems, neither for ordering Grab nor for video calls. Da Nang, Hai Phong, and Can Tho are in the same league.
Ha Long: the city and port are fine, but as soon as the boat enters among the karsts, the signal drops and disappears in many anchorages. If you take a cruise, assume that the bay is a black hole and download maps and music before boarding. It happens to everyone, with a local SIM or an eSIM.
Sapa: in the town and on the road, there's good 4G signal. On treks through the rice paddies and in homestays above 1,500 meters, it becomes patchy, and Viettel is the only one that holds up with some dignity.
Rural areas (Ha Giang, Mai Chau, Phong Nha, Mekong): better than you expect. There's 4G in tiny villages, with blind spots on mountain passes and in caves. An eSIM supported by Viettel gives you the best available network without you having to choose.
How much data you really need
The question I get most often. The short answer is that almost everyone buys too much because they think in gigabytes, not in usage. An average traveler in Vietnam, who sleeps in hotels with Wi-Fi and uses mobile data on the street, uses between 300 and 700 MB per day. With a 1 GB daily plan, you'll have plenty; with 10 GB for two weeks, you'll be cutting it close only if you watch a lot of videos.
| Activity | Approximate Consumption | On a typical day |
|---|---|---|
| Google Maps / navigation | 5 MB/hour | ~30 MB |
| WhatsApp (text and audio) | 1–3 MB per active chat | ~40 MB |
| Grab (ordering a car or food) | 5–10 MB per trip | ~30 MB |
| Instagram / TikTok | 150–250 MB per 15 min | ~400 MB |
| Uploading photos to the cloud | 3–5 MB per photo | ~150 MB |
| Video call | 250–400 MB/hour | ~250 MB |
In other words: if you don't spend all your time on TikTok, 1 GB per day is more than enough for a normal trip to Vietnam. Three tricks I always use: download offline maps for each city, set photo backups to "Wi-Fi only," and download series for the night bus from the hotel. With that, you avoid paying for gigabytes you won't use.
Final comparison: Local SIM vs. eSIM
Both options rely on the same Vietnamese antennas, so the network quality you'll experience is practically identical. The difference lies in what surrounds the connection: time, paperwork, risk, and peace of mind.
| Criterion | Vietnamese Local SIM | Travel eSIM |
|---|---|---|
| Data price | Unbeatable (€2–8 per plan) | Slightly higher (from ~€10), no surprises |
| Activation time | Upon arrival, at the counter | Before flying, from your sofa |
| Passport and registration | Mandatory, in person | No need to hand it over at a counter |
| Your home number | Stays out (you change cards) | Remains active in parallel |
| Risk of overpricing | High at the airport | None: fixed price in euros |
| Recharge or extension | In-store, with app in Vietnamese | Online, in two taps |
My take: if you're staying for three months in Vietnam, traveling on a very tight budget, and don't mind spending a morning handling the paperwork at an official Viettel store in the city center, a local SIM card wins on price. If you're traveling for 1 to 4 weeks and value your time, an eSIM is the clear winner: the real difference is five minutes versus an hour in line with jet lag, passport in hand, and a salesperson trying to upsell you.
Frequently asked questions
Do I need a passport to have internet in Vietnam?
For a local SIM, yes: Vietnam requires each card to be registered with an ID document, and the seller will scan your passport. With an eSIM, you buy online and do not present your passport at any counter.
Does WhatsApp work in Vietnam?
Yes. WhatsApp, Instagram, Google, Gmail, and Facebook work normally without a VPN. Locals use Zalo a lot, the national messaging app, but as a tourist, you don't need it.
Is there 5G in Vietnam?
Yes: all three operators have commercial 5G in Hanoi, Ho Chi Minh, Da Nang, Hai Phong, and Can Tho, among others. Outside these cities, 4G is normal, with 15–50 Mbps, sufficient for everything a tourist does.
Which Vietnamese operator has the best coverage?
Viettel. It is the largest in the country, with over half the market, and the most reliable in mountainous and rural areas (Sapa, Ha Giang, Mekong). Vinaphone excels in urban 5G speed, and Mobifone performs well in the south.
How many GB do I need for two weeks in Vietnam?
Between 10 and 15 GB covers a normal 14-day trip if you sleep in hotels with Wi-Fi. If you upload a lot of photos or constantly use social media, estimate 1 GB per day and you'll be fine.
Is it safe to buy a SIM at Hanoi or Ho Chi Minh airport?
It's legal, but it's usually 30–50% more expensive than at an official store in the city center, and it's where there are the most complaints about changed plans. If you buy there, demand the sealed package and pay in dong.
Will I have coverage on a cruise in Ha Long Bay?
Only partially. In Ha Long city and the port, the signal is good, but it drops significantly among the karstic formations and disappears in some anchorages. Download maps and music before boarding: it happens to everyone.
Is my phone compatible with an eSIM?
Almost certainly if it's from recent years: iPhone XS or later, Pixel 3 onwards, and most recent Samsung Galaxy S20+, Xiaomi, and Motorola. Check by dialing *#06#: if an EID code appears, it supports eSIM.
Conclusion
To summarize the internet landscape in Vietnam: roaming is convenient but can ruin your budget; Wi-Fi is everywhere and an excellent complement, but never a primary plan; pocket Wi-Fi only pays off if you're a large group with laptops; a local SIM is the cheapest but costs you a passport, a queue, and the risk of being overcharged. And an eSIM combines the best of all: the same Viettel, Vinaphone, and Mobifone networks, a fixed price in euros, zero paperwork, and your Spanish number intact.
If you ask me what I would do for a two-week trip through Hanoi, Ha Long, Sapa, and Ho Chi Minh, it's clear: buy the eSIM before leaving home, install it with my home Wi-Fi, and forget about it until I land at Noi Bai. It's the difference between starting the trip by ordering a Grab in two minutes or starting it queuing with your passport in hand.
Go for practicality: check out the PuraSIM eSIM for Vietnam, choose the days and data you need according to the consumption table above, and arrive in Vietnam connected from minute one.
