Like any good traveler, I had carefully planned almost every stage of my trip to Vietnam. My itinerary included Hanoi, a trek through the rice terraces of Sapa, a cruise in Halong Bay and a few days by the sea in Central Vietnam. But as we all know, unexpected events are part of travelling… and the one I encountered was hardly a minor inconvenience: a typhoon arrived just as I was supposed to reach Halong Bay.
The cruises were obviously suspended, forcing me to change a large part of my plans while I was already on the road. All of a sudden, I had to check the new departure schedules, contact my accommodation, rearrange several transfers and find a different way to reach the bay. In the end, I managed to reorganize the itinerary, but it was far from easy.
It is in situations like this that you realise how important it is to remain independent and have an active Internet connection throughout your trip. Not just to post photos or stay in touch with your family, but also to manage anything that may change while you are traveling from one place to another.
First note so self: an eSIM would have made things a lot easier…
Looking back at that experience, having an eSIM already installed before departure would have made managing those unexpected changes much easier. This is where a service such as Sim Local becomes particularly useful: it allows travelers to arrange their mobile connection in advance and access data as soon as they arrive in Vietnam, without having to find and activate a physical SIM card first.
After all, Vietnam is not the kind of country where you are likely to stay in one place for the entire trip. It is a long and incredibly diverse country, where an itinerary, like mine, may include night trains, domestic flights, minivans, taxis, ferries and all kinds of transfers. During my 15-day itinerary in Vietnam, I focused on northern and central regions, moving several times and finding myself in a completely different setting within the space of just a few hours.
Having your own mobile connection is not essential every second of the day, but it makes this kind of journey much easier to manage. In this article, I want to look at the different situations in which you may need Internet access in Vietnam, explain the differences between a local SIM and an eSIM, and consider when a specialized service can be useful.
Why you need Internet when traveling in Vietnam
When planning a trip, we tend to think of Internet access mainly in terms of communication: WhatsApp, email and social media. In reality, during my trip to Vietnam, my smartphone proved most useful for far more practical reasons.
The first was navigation. In Hanoi, as in other Vietnamese cities, finding your way without a map is not always straightforward. The streets are extremely chaotic, traffic is relentless and very few taxi drivers speak English. On more than one occasion, I had to show the driver my exact destination on Google Maps.
The second reason is Grab, one of the most useful apps for getting around Vietnam. It works in a similar way to Uber: you enter your pick-up point, choose your destination and see the price of the journey in advance. The app also shows the driver’s name, vehicle model and license plate. It is all very convenient, provided you have an Internet connection exactly when you need it.
Internet access also allows you to use translation apps, check timetables, retrieve a booking and contact a hotel or travel agency. These are simple tasks when you are connected to your hotel’s Wi-Fi, but much less so when you are standing outside a station, waiting for a minivan or in an unfamiliar part of a city with no idea where to go.
Then there are the unexpected events. The typhoon that affected Halong Bay forced me to reorganize my itinerary while I was already traveling. At that point, I needed a connection to check updates, compare the available alternatives and communicate with the people arranging my transfers. To me, this is the main reason why it is better not to rely exclusively on the Wi-Fi networks you find along the way.
What is Wi-Fi like in Vietnam?
When it comes to Wi-Fi in Vietnam, I can reassure you: during my trip, Wi-Fi was very easy to find. Hotels, restaurants and cafés almost always offered a free connection.
Getting online in cities is therefore not difficult. Hanoi has plenty of cafés and other places with Wi-Fi, and the same is true in the main tourist destinations. One detail I remember is the Vietnamese fondness for very simple numerical passwords: combinations such as 123456789 or 11223344 were quite common.
That certainly does not mean that Wi-Fi can completely replace a mobile data connection.
The real issue is not finding Internet access once you have reached your hotel, but having it while moving from one place to another. To request a ride with Grab, you need to be online before getting into the car. The same applies when you need to look up an address, tell a guide that you are running late or show a booking just after stepping off a train.
There is also security to consider. Occasionally connecting to a hotel network is one thing; constantly using unfamiliar public networks to access your email, payment services or other personal accounts is another. Whenever possible, I prefer to use my own mobile data connection for these activities.
The situation may also change outside the cities. The fact that accommodation in the mountains around Sapa has Wi-Fi does not mean that you will have a stable connection throughout the trek. And when you are surrounded by rice terraces, believe me, being able to check a map or contact your guide can be extremely useful.
Local SIM or eSIM in Vietnam: which should you choose?
To access mobile data without relying on Wi-Fi, you can buy a physical Vietnamese SIM card or use an eSIM. Both options allow you to connect to the country’s mobile networks, but they are purchased and installed in different ways.
A physical local SIM card
A local SIM is the traditional solution. You buy a physical card at the airport, in a mobile phone shop or from another retailer, and insert it into your smartphone. It can be cost-effective and, depending on the package, may include data, calls and text messages with a Vietnamese phone number.
However, it takes a little more time. You need to find a reliable shop, choose a package, potentially show identification and wait for the card to be activated—and on a multi-stop journey, time is something you always need to consider carefully. If your phone has only one SIM slot, you will also need to temporarily remove your usual SIM card.
It is important to buy the card from an official or otherwise trustworthy retailer and make sure it has been registered and activated correctly. A very low price is of little value if the connection stops working as soon as you leave the shop.
An eSIM
An eSIM, on the other hand, is a digital SIM. It does not require a physical card: you buy a plan online and install it on your phone using a QR code, an app or a guided process in your smartphone settings.
The main advantage is that you can arrange everything before departure. You do not have to look for a shop after a long flight, and there is no need to replace your physical SIM. On dual-SIM phones, you can keep your usual number active while using the eSIM for mobile data. You should, however, disable data roaming on your home SIM to avoid unexpected charges.
Before buying an eSIM, you need to check that your phone is compatible and not locked to a specific mobile network. You should also find out whether the plan provides data only or includes calls and text messages, whether hotspot use is allowed, and when the plan’s validity period begins.
In short, a physical SIM may be suitable if you want to buy a package after arriving in Vietnam and perhaps need a local phone number. An eSIM is more convenient for travelers who prefer to have their connection ready in advance and do not want to spend time at an airport kiosk or phone shop.
Sim Local: Best eSIM for Vietnam
If you prefer to arrange your mobile connection before departure, one option worth considering is a Sim Local eSim, which offers several plans for Vietnam that connect to mobile networks available in the country.
The name may initially cause some confusion: Sim Local is not a Vietnamese mobile operator, and you will not receive a physical SIM card by mail. Sim Local sells travel eSIMs that connect to selected local operators once installed. The network provider and connection features vary according to the plan you choose. It is therefore important to read the plan details rather than assume that every option works in exactly the same way.
For Vietnam, plans are available with different data allowances and validity periods. Some provide data only, while others may also include calls and text messages. You can choose between fixed data packages and plans described as “unlimited”, which include a daily allowance of full-speed data.
Sim Local Unlimited Plans for Vietnam
For travelers who expect to use more data, Sim Local offers two unlimited options. The Unlimited plan includes 5GB of full-speed data per day, while Unlimited Pro includes 10GB per day at full speed. The allowance resets automatically every day. Once the daily full-speed allowance has been used, the connection remains available at a reduced speed until the next reset.
Hotspot and tethering are included in all Sim Local plans at no additional cost. This can be particularly useful if, like me, you sometimes need to work while traveling and connect your laptop when reliable Wi-Fi is unavailable. Keep in mind, however, that working from a computer, joining video calls or uploading large files can use data much faster than ordinary smartphone activities, so the higher daily allowance may be worth considering.
Before purchasing, you should still check the latest plan details, validity period and included services to make sure the option you choose is suitable for your trip.
Access to 4G or 5G also depends on the plan, the associated network provider and the coverage available in your location. You are more likely to find a strong connection in cities and major tourist destinations, while performance may vary in mountain areas, on trekking routes and far from the coast. This applies to Sim Local, just as it does to any service relying on local mobile infrastructure.
You can buy the eSIM online by selecting Vietnam, the length of your trip and the amount of data you need. After payment, you receive a QR code and instructions for configuring the eSIM. Alternatively, you can manage it through the Sim Local app. It is advisable to install it the day before departure, following the instructions provided by the company. If you encounter any problems, Sim Local offers support via WhatsApp and email.
How much data do you need for a trip to Vietnam?
There is no single data allowance that will be right for everyone. It depends on the length of your trip and, above all, how you use your smartphone.
If you mainly need a connection for Google Maps, Grab, WhatsApp, translations and occasional searches, your data consumption should remain relatively low. A few gigabytes may be enough for one or two weeks, particularly if you continue to use your hotel’s Wi-Fi for updates and more data-intensive activities.
Data usage increases when you upload lots of photos and videos, watch streaming content or make video calls. Using your phone as a hotspot can also consume your allowance quickly, especially if you connect a computer that begins running automatic updates and synchronizations.
Before choosing a plan, it is useful to consider which of these three profiles best describes you:
- light use: maps, messages, Grab and occasional searches;
- moderate use: social media, photo uploads and frequent browsing;
- heavy use: videos, remote work, video calls and hotspot use.
Personally, I would avoid buying the largest package without considering whether I actually needed it, but I would also avoid choosing the smallest allowance just to save a few euros. On a multi-stop journey, it is better to have a little data in reserve, especially if you expect to use maps frequently or have a schedule involving several transfers.
Internet access in Hanoi, Sapa and Halong Bay
Your connectivity needs can vary considerably from one stop to another. My trip to Vietnam was a fairly clear example of this.
Hanoi: Grab, maps and addresses
Wi-Fi is widely available in Hanoi, but mobile data becomes most useful when you step outside your hotel. In my article about the best things to do in Hanoi, I described just how chaotic the capital’s streets and traffic can be.
When traveling from one part of the city to another, Grab lets you see the price in advance and helps you avoid many communication difficulties. Google Maps is equally useful when you need to show an address to a taxi driver who does not speak English. In both cases, you need a connection at the exact moment you are standing in the street, not just before leaving your hotel.
Sapa: transfers, trekking and contacting your guides
Reaching Sapa means taking a night train from Hanoi to Lao Cai and then continuing by minivan. In my case, I chose a two-day trek in Sapa, with an overnight homestay and a route through rice terraces and ethnic minority villages.
Wi-Fi was more widely available than I had expected, but having your own connection remains useful for confirming the minivan departure time, contacting the travel agency and managing the different stages between the train, your accommodation and the starting point of the trek. On more isolated trails, however, the mobile signal may be weak or unavailable. It is therefore always a good idea to download offline maps in advance and save important addresses and bookings on your phone.
Halong Bay: weather and changes of plan
Halong Bay is probably the most significant example. Cruises depend on weather conditions and may be suspended or postponed when a typhoon approaches. This is exactly what happened during my trip and forced me to rethink that part of my itinerary completely.
Being able to receive updates from the cruise company, check the weather and contact other travel providers helps you respond more quickly. Once on board, however, coverage may become weaker as you move away from the coast. During my three days in the less touristy Bai Tu Long Bay, my priority was to enjoy the scenery, but having access to the latest information before boarding was essential.
How to install and use Sim Local
Installing an eSIM is quite straightforward, but it is better not to leave it until you land. The exact procedure may vary slightly between iPhones and Android smartphones, but the main steps are as follows:
- check that your phone supports eSIMs and is unlocked;
- choose a Vietnam plan based on the length of your trip and the amount of data you need;
- buy the plan and keep the QR code you receive;
- connect to a stable Wi-Fi network and add the eSIM through your phone settings;
- give the new line a recognizable name, such as “Vietnam”;
- keep the eSIM switched off until the time specified in the instructions;
- on arrival, select it as your mobile data line and enable data roaming only for the eSIM, if required by the plan;
- disable data roaming on your home SIM.
Do not delete the eSIM profile if the connection does not work immediately: the same QR code often cannot be used twice. If you experience difficulties, check the APN settings provided in the instructions or contact customer support.
Once the setup has been completed correctly, your eSIM will be ready to use when you arrive in Vietnam.