Which eSIM Should You Choose for Vietnam? Stay Connected from Hanoi to Phu Quoc Without Searching for a SIM at the Airport

You may need mobile data within minutes of landing in Vietnam—to order a Grab, open your hotel booking, translate an address, or message the person meeting you. Installing a travel eSIM in advance lets you postpone or avoid buying a local SIM.

A digital profile is purchased online and added to a compatible smartphone without a plastic SIM card. After arrival, simply turn on the new line, select it for mobile data, and wait for it to connect to a partner network.

Do not choose a package by price alone. A route through Hanoi and Ho Chi Minh City has different connectivity needs from a beach holiday in Nha Trang or a trip to Phu Quoc and the mountains. Below, we explain how to choose an eSIM for Vietnam, estimate your data needs, and prepare your phone before departure.

What Is an eSIM, and Why Is It Useful in Vietnam?

An eSIM, or embedded SIM, is a built-in SIM that stores a carrier profile downloaded remotely. It performs the same core function as a plastic SIM card by registering your device on a mobile network and providing access to cellular services.

Do not confuse an eSIM with an app or virtual number. A provider’s app may help you buy and manage a package, but the profile itself is installed in your phone’s system settings. Whether a phone number is included depends on the plan.

A travel eSIM gives you:

• mobile data as soon as you arrive;
• the option to keep your regular number active;
• the ability to buy a plan before the trip;
• no need to find a mobile store;
• access to maps, Grab, translation tools, and messaging apps;
• the option to share data if the package supports tethering;
• protection against accidentally using costly roaming data on your home SIM.

An eSIM is particularly convenient for a late arrival, a stopover, or independent travel. You can receive and install the profile at home over stable Wi-Fi, with the instructions close at hand.

How Does an eSIM Work in Vietnam?

A travel eSIM is usually issued by an international provider and connects to one or more partner networks in Vietnam. Your phone treats the profile as a separate mobile line.

Here is how it works:

1. Choose and purchase a plan.
2. The provider sends a QR code or manual installation details.
3. Add the profile to your smartphone.
4. After arrival, the device finds an available Vietnamese network.
5. The eSIM registers on that network and provides mobile data.

Most travel packages are data-only. They provide internet access but usually do not include a local number, voice minutes, or SMS. Use internet-based services for communication and keep your home SIM active for bank messages.

Travel eSIMs often require Data Roaming to be enabled. This does not mean the phone will use data through your home carrier. Turn the setting on specifically for the travel profile so it can connect to a partner network.

It helps to distinguish between three steps:

• installation — adding the profile to your phone;
• activation — starting the package;
• connection — registering the device on a mobile network.

Revosim states that the profile can be installed in advance and activates when it connects to a network in the destination country. Check the selected plan for the exact terms.

A Quick Overview of Mobile Networks in Vietnam

Vietnam’s main mobile networks include Viettel, VinaPhone, and MobiFone. An international eSIM may connect through one or more partner networks depending on the package.

Hanoi, Ho Chi Minh City, Da Nang, Nha Trang, and other major cities generally have developed 4G/LTE coverage. 5G is available where the operator, plan, and device support it.

Connection quality may change when traveling:

• to Phu Quoc and other islands;
• through the northern mountains;
• between smaller towns;
• inside national parks;
• by sea;
• to remote beach areas.

Even where the coverage map looks good, thick walls and the location of the nearest base station can weaken indoor reception. Speed also depends on network congestion and your phone’s capabilities.

The profile automatically selects an available partner network with a stable signal, which is useful when moving between cities and resorts. An eSIM cannot create coverage where local networks have no signal, so offline maps and saved addresses are still worth keeping.

Which eSIM and Data Plan Are Best for Vietnam?

There is no universal answer: the best package depends on your route, trip length, and usage habits. Consider the following factors when choosing an eSIM for Vietnam.

Itinerary

A Vietnam-only plan is suitable if you are visiting one city or resort. If your route continues to Thailand, Cambodia, Malaysia, or another country, compare it with a regional Asia eSIM.

A regional package is more convenient across borders, but a country plan may provide more data for the same price.

Trip Length

The package should remain valid throughout your trip. A 3–7-day plan is enough for a short visit, while 10–15 days suits a typical holiday. For a long stay or remote work, look for a 30-day option and the ability to buy another package.

Data Use

Maps, text messages, and restaurant searches use relatively little data. The following consume a package much faster:

• video streaming;
• video calls;
• photo uploads;
• cloud syncing;
• app updates;
• tethering to a laptop.

For navigation and messaging, 1–3 GB is usually enough. For a more active holiday, consider 5–10 GB. Remote work and regular tethering may require 10–20 GB or unlimited data.

Fixed Data or Unlimited?

A fixed allowance is better value for moderate use when hotel Wi-Fi is available. Unlimited data is more convenient for video calls, remote work, and a busy itinerary.

However, “unlimited” may include a fair-use policy. After a specified daily allowance, the operator can reduce your speed until the next reset period. Check the terms before purchasing.

Tethering

You will need hotspot support to connect a laptop, tablet, or a travel companion’s phone.

Phone Compatibility

Your phone must support eSIM and be unlocked for use with other carriers. On iPhone, look for Add eSIM. On Android, the option may be called Add eSIM, Add mobile plan, or Download SIM.

The same model may have several regional versions, so check the exact device variant.

Which eSIM Should You Buy for Vietnam?

For a one-week beach holiday with reliable hotel Wi-Fi, 1–3 GB may be enough for Grab, maps, messaging, and web searches.

For a two-week sightseeing trip, consider 5–10 GB. This is generally enough for navigation, communication, photo uploads, and occasional video without strict rationing.

If your itinerary crosses several cities and includes long transfers, leave a data buffer. You tend to use mobile internet more often on the road and have less access to Wi-Fi.

For Phu Quoc, coverage matters as much as price. A travel eSIM connects through local networks, but signal quality varies by area of the island.

Remote work, video conferences, and laptop tethering call for 10–20 GB or unlimited data. Review full-speed and hotspot restrictions before paying.

Before deciding which Vietnam eSIM to buy, answer four questions:

1. How many days will the trip last?
2. Which cities and islands are on your itinerary?
3. Will you make video calls or use tethering?
4. Do you need a local phone number?

The final question matters. If you need a number for voice calls or registration with local services, a standard data-only package may not be enough.

Revosim eSIM Plans for Vietnam

The Vietnam eSIM page lists 12 fixed-data and unlimited packages. Prices and availability were correct when this article was prepared and may change.

For a short trip with basic needs, 1 GB for seven days may be enough. The 2–5 GB packages suit moderate mobile-data use when hotel Wi-Fi is available.

The 10 GB and 20 GB plans work well for independent travel, frequent video calls, and occasional tethering. Unlimited data removes the need to track your balance, but review the full-speed usage policy before buying.

How to Buy a Vietnam eSIM Online

You can purchase an eSIM entirely online, with no visit to a mobile store and no plastic SIM card.

Follow these steps:

1. Check that your phone supports eSIM.
2. Open the Revosim plans page.
3. Choose a data allowance and validity period.
4. Review the activation and tethering terms.
5. Proceed to checkout.
6. Pay using one of the available methods.
7. Receive the QR code and instructions.
8. Save the setup details for offline access.

The QR code is issued instantly and no passport is required. Current payment methods are shown at checkout.

You can buy a Vietnam eSIM after arrival if you have Wi-Fi, but doing so before departure is safer and more reliable. It gives you time to check your phone, install the profile, and contact support if necessary.

Ideally, open the QR code on another device, such as a laptop or a travel companion’s phone. If it is saved on the same phone where you are installing the eSIM, use manual setup if the instructions provide it.

Do not share the QR code with anyone. It provides access to the purchased profile and may be valid for only one installation.

How to Get an eSIM for Vietnam

You do not need to create or program an eSIM yourself. When travelers ask how to “make” a Vietnam eSIM, they generally mean three steps:

1. Choose and purchase a plan.
2. Add the profile you receive to your phone.
3. Turn it on after arrival and select it for mobile data.

The embedded module is already inside a compatible device. The provider creates the digital profile, and you install it through the system settings.

How to Install an eSIM for Vietnam

Install the profile at home over stable Wi-Fi. Before you begin:

• update your operating system;
• confirm that the phone is compatible;
• make sure the device is carrier-unlocked;
• save the QR code;
• check when the validity period begins;
• keep the manual installation details available.

Installing an eSIM on iPhone

1. Open Settings.
2. Go to Cellular or Mobile Data.
3. Tap Add eSIM.
4. Select Use QR Code.
5. Scan the code you received.
6. Confirm that you want to add the plan.
7. Give the line a clear label, such as “Vietnam Revosim.”
8. Leave the profile turned off until the trip if the package terms allow it.

If the QR code is not recognized, enter the setup details manually. Do not delete a successfully installed eSIM: the code may not work again.

Installing an eSIM on Android

The exact path depends on the manufacturer. On Samsung, the menu is usually under Connections > SIM Manager; on Google Pixel, look under Network & internet > SIMs.

The general process is:

1. Open your mobile network settings.
2. Choose the option to add a new SIM.
3. Tap Add eSIM or Download SIM.
4. Scan the QR code.
5. Confirm the profile installation.
6. Give the line a recognizable name.
7. Make sure the eSIM appears in the SIM list.

If the option is missing, search Settings for “eSIM.” Its absence may mean that your device or regional variant does not support the technology.

How to Connect and Activate an eSIM in Vietnam

After landing, turn off Airplane Mode and give your phone a few minutes to find a network. Then:

1. Open your SIM settings.
2. Turn on the Revosim profile.
3. Select it as the mobile-data line.
4. Enable Data Roaming specifically for the travel eSIM.
5. Disable mobile data on your home SIM.
6. Turn off automatic switching between data lines.
7. Wait for the eSIM to register on a partner network.

Simply adding the profile is not enough to connect an eSIM in Vietnam. It must be enabled and selected as the source of mobile data.

If no network appears, turn on Airplane Mode for about 30 seconds and then turn it off. Restarting the device may also help.

Select a network manually or change the APN only when instructed by the provider. Random changes can prevent automatic connection.

How to Use an eSIM in Vietnam Alongside Your Regular Number

Modern smartphones can keep two lines active. A practical setup is:

• use your home SIM for SMS and important calls;
• set Revosim as the mobile-data line;
• disable mobile data on your home number;
• turn off automatic switching between data lines.

This allows you to receive bank messages without using your home SIM for data. Incoming SMS and call charges depend on your home carrier, so check its roaming terms in advance.

To prevent the package from running out early, disable:

• automatic updates;
• backups over mobile data;
• photo syncing;
• automatic video downloads;
• background app updates.

Reset your mobile-data statistics on the activation day to see which apps use the most data.

Turn on tethering through the standard hotspot settings and make sure the travel eSIM is selected as the data source. If it does not work, check the plan terms and APN settings.

How to Find Your Vietnam eSIM Phone Number

First, determine whether the plan includes a phone number at all. A data-only eSIM may have no dialable number because the profile is intended exclusively for mobile internet.

The absence of a number does not affect maps, browsers, messaging apps, or other internet services. However, standard calls, SMS, and registration with services that require a local number will not be available.

If a phone number is included, look for it:

• in the email containing your eSIM details;
• in the activation instructions;
• in your provider account;
• in the installed plan details;
• in your smartphone settings.

On iPhone, open Settings > Cellular and select the line. On Android, check About phone, SIM status, or SIM Manager.

The phone-number field may remain blank even when the profile works. In that case, rely on the information supplied by the provider.

Do not confuse a phone number with technical identifiers:

• ICCID identifies the SIM profile;
• EID identifies the device’s embedded eSIM module;
• IMEI identifies the phone.

None of these identifiers is a phone number that can receive calls or SMS.

Most travel eSIMs are data-only, so confirm that a Vietnamese number is included in the specific package before buying.

Travel eSIM, Local SIM, or International Roaming?

For most travelers with a compatible smartphone, an eSIM is convenient because it can be prepared in advance. A local SIM is useful if you need a Vietnamese number, while roaming may suit light users whose home carrier offers an appropriate package.

What to Do If Your eSIM Does Not Work in Vietnam

If these standard steps do not help, do not delete the profile. Take screenshots of your settings, note the displayed network name, and contact support over Wi-Fi. Deleting the eSIM may make reinstallation more difficult.

Frequently Asked Questions

What Is the Best eSIM for One Week in Vietnam?

For maps, Grab, and messaging, 1–3 GB may be enough. If you plan to stream video, use social media heavily, and travel frequently, consider 5 GB or an unlimited seven-day plan.

Which eSIM Should I Choose for Nha Trang?

Choose a Vietnam plan with validity that covers your trip. Select the data allowance based on how much time you will spend away from the hotel and the quality of local Wi-Fi.

Does an eSIM Work on Phu Quoc?

A travel eSIM connects through available local networks. Phu Quoc has mobile service, but quality varies by area, terrain, and distance from the nearest base station.

When Should I Activate the eSIM?

The package terms determine the exact timing. Revosim recommends installing the profile in advance and using it after it connects to a network in the destination country.

Does a Travel eSIM Include a Local Phone Number?

Not always. Most travel eSIMs are data-only. If you need a Vietnamese number, the plan must explicitly state that one is included.

Can I Receive Bank SMS on My Home SIM?

Yes, if your primary SIM remains active and your carrier provides roaming. Disable mobile data on that line.

Can I Install One eSIM on Two Phones?

Usually, one profile can be installed on one device only. A second phone requires a separate package or tethering.

Do I Need a Regional eSIM for a Trip Around Asia?

A regional package may be more convenient if your route includes several countries. For a trip entirely within Vietnam, a country plan often offers better value.

Can I Delete and Reinstall the Profile?

Not always. The QR code may be single-use. Do not delete the eSIM before your trip ends unless support advises you to do so.

Which Plan Should You Choose?

For a short trip and basic needs, 1–3 GB is enough. For an active sightseeing holiday, allow 5–10 GB. Remote work, video calls, and tethering may require 10–20 GB or unlimited data.

It is best to buy your Vietnam eSIM before departure. This leaves time to check the phone, install the profile, and save the instructions. After landing, turn on the line, select it for mobile data, and enable Data Roaming for the travel eSIM.

If you need a Vietnamese phone number, confirm that it is included before paying: most travel packages provide data only.

Current offers are listed on the Revosim Vietnam eSIM page. Choose the data allowance and validity period that fit your itinerary, and your connection will be ready as soon as the eSIM joins a local network.