Vietnam SIM Card or eSIM: Which Should You Buy?
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You have just arrived in Vietnam and need to find your hotel. You may want to book a ride through Grab (a ride-hailing app similar to Uber), check the pickup point or show a taxi driver the address. Having mobile data ready can make those first few hours much easier.
Should you arrange an eSIM before travelling, or buy a physical SIM after you arrive? Both can give you internet access. The better choice depends on your phone, whether you want help with setup, and whether you need local calls or messages as well as data. I learned the value of planning that first connection the awkward way in Can Tho, a city in southern Vietnam. A simple trip to the hotel turned into a search for a mobile shop and an ATM. I share the full Can Tho arrival story later in this guide, along with what I would do differently next time.
Quick answer: If your phone supports eSIM and is unlocked, arrange a data eSIM before you travel so you can use maps and request your first Grab on arrival. If your phone needs a physical SIM, buy one from an official carrier store and bring your passport and Vietnamese dong.
In this guide
- Why I would arrange data before arriving
- Choose your option in a minute
- Do you need a Vietnamese number for Grab?
- What does “eSIM with a phone number” actually include?
- Compare travel eSIM options for Vietnam
- Visiting more than one country? Compare a regional eSIM
- Three purchase routes worth comparing
- What to check before you pay
- Set up the phone before relying on it
- If your phone cannot use eSIM
- Vietnam SIM Card and eSIM FAQ
- Which would I choose for this trip?
Why I would arrange data before arriving
On my first trip to Vietnam, I travelled overland from Cambodia and arrived in Can Tho without a local SIM. I needed a connection to order a Grab to the hotel, but first I had to find a mobile shop—with no internet to search Google Maps.
I walked around looking for one, and the language barrier made asking for directions harder. When I finally found a shop, it did not accept my card. We then had to find an ATM to withdraw Vietnamese dong before I could pay for the SIM. What should have been a simple ride to the hotel became a much longer errand.
A suitable eSIM, installed before the journey and connected on arrival, could have saved that hassle: I could have looked for an ATM, checked the hotel address and requested a Grab. I bought a physical SIM that day and got connected, but I would rather have spent those first hours settling in than searching for a shop.
The same need applies at an airport. Even if you take a regular taxi, mobile data lets you open the hotel location and check where you are going. Before leaving, save the hotel address and download an offline map as a backup. If your phone supports eSIM, install the chosen plan over a reliable connection and follow its activation instructions before relying on it.
A translation app can also help when asking for directions or reading a menu. Before departure, download the available Vietnamese language pack in Google Translate and test it on your phone. Google’s offline-language instructions explain how supported downloads can help you translate without a connection, including camera translation on supported devices.
Choose your option in a minute
Swipe sideways if needed to see all columns.
| Your priority | Start by comparing | What to confirm |
|---|---|---|
| Maps, internet messaging and an existing Grab account | A physical SIM or eSIM with a suitable data package | Device support, data allowance, validity and activation |
| Ordinary calls to local businesses or a Vietnamese number people can call | A local-carrier SIM or eSIM with suitable voice service | Assigned number, incoming/outgoing calls and included minutes |
| SMS or a particular verification code | A plan with the exact messaging capability you need | Receiving and sending SMS, and whether that service accepts the number |
| Your phone does not support eSIM, or you want staff to help | A physical SIM from a carrier store | Phone compatibility, registration, package and activation test |
The format tells you how the SIM goes into your phone: a physical card or a downloaded eSIM profile. The package tells you what you get: data, calls and messages. Choose both around your needs.
Do you need a Vietnamese number for Grab?
You do not need a Vietnamese number simply to register for Grab. Set up your account before departure using a number you can verify. Grab explains this in its official app guidance, and its Vietnam tourist information recommends registering before your trip.
Once the account is ready, your travel data connection lets you request a ride. Calling a hotel or driver through the phone’s normal dialler is different: that needs a package with calls, rather than just mobile data.
What does “eSIM with a phone number” actually include?
If ordinary local calls or SMS matter to you, ask the seller three questions before buying:
- Does this package include a Vietnamese +84 mobile number?
- Can it receive and make domestic calls, and how many minutes are included?
- Can it receive and send SMS? If you need a particular verification code, does that service accept this number?
Save the answers with your order details. A phone number alone does not confirm that all three services are included.
Compare travel eSIM options for Vietnam
For a concrete comparison, take one traveller choosing 5GB of data with 30-day validity. These packages can cover a one- or two-week visit without renewing after seven days, provided you stay within the 5GB allowance. The booking links open each provider’s main site; select Vietnam, 5GB and 30 days.
Swipe sideways if needed to see all columns.
| Provider | Data allowance | Validity | Listed price (USD) | Useful distinction |
|---|---|---|---|---|
| Saily | 5GB total | 30 days | $10.99 | Hotspot sharing listed without a separate restriction. |
| Airalo | 5GB total | 30 days | $11.00 | Select the fixed-data Vietnam package; unlimited offers are separate. |
| Yesim | 5GB total | 30 days | $11.52 | Displayed sale price; hotspot availability depends on the operator. |
All three packages in this table are data-only: they do not include a Vietnamese +84 phone number, ordinary calls or SMS. You can use the data for messaging and internet calls through apps such as WhatsApp. Separate phone-number or calling add-ons are not included in these prices.
Prices checked on October 22, 2026 on official sites, without coupon codes. Yesim’s price is promotional; confirm the total at checkout.
My starting choice for this example would be Saily’s 5GB plan. At $10.99 it fits the allowance and validity above and explicitly supports hotspot sharing. Airalo costs just one cent more, so price alone is no meaningful reason to switch if you already use it.
For light maps and messaging with hotel Wi-Fi, a smaller allowance can reduce the cost: Saily also lists 3GB for 30 days at $7.99. For video uploads or regular laptop use, choose more data instead. Official package details: Saily, Airalo and Yesim.
Other pricing models: GigSky is another option to check if you already use its app or have an eligible card benefit. Drimsim charges by usage; include any initial purchase and balance requirement when comparing it with a bundle. Neither is ranked in the price table above.
For a mountain or rural itinerary, the package’s local network and coverage along your route matter more than a small price difference.
Visiting more than one country? Compare a regional eSIM
If Vietnam is one stop on a longer Southeast Asia trip, a regional eSIM may save you buying a new data package every time you cross a border. That is especially relevant to a journey like Cambodia to Vietnam: the useful feature is having a plan that covers both sides of the trip.
For example, Saily’s Asia and Oceania country list currently includes Cambodia, Vietnam and Thailand. Airalo also offers Asia regional packages; open the selected package’s country list before buying. “Asia” does not mean every Asian country.
Compare the total regional-plan price with the combined cost of separate country plans, using the same travel days and expected data use. Check whether the allowance is shared across countries and when validity starts. Saily’s regional page says activation begins in the first included country when the required settings are enabled, so time spent in Cambodia can use up validity before you enter Vietnam.
A regional plan can simplify your arrival, but it does not guarantee coverage in every border area or provide a local phone number in every country. Choose it for the destinations and data you need, and check voice or SMS separately.
Three purchase routes worth comparing
A travel eSIM when data is the main job
For the simplest arrival, buy your chosen travel eSIM before departure and install it over a stable connection. Follow its activation instructions: installing the profile and starting the package’s validity are not always the same step.
A local-carrier line when calls or a number matter
If you need ordinary domestic calls, compare the local carrier’s own packages. Viettel’s official guidance lists a valid passport for short-stay foreign visitors and describes store registration. Use an official store if your documents are not supported by its self-service process, and have staff explain the package and test the line.
MobiFone’s tourist-oriented Hi Vietnam route
MobiFone’s Hi Vietnam service is an app-based tourist option with data and domestic-call packages.
Registration involves passport and identity checks, so leave time to complete the process before relying on it for your first connection. Follow the app’s instructions to install and activate the line, and confirm SMS support separately if you need messages.
What to check before you pay
Write down the total checkout price beside these details:
| Detail | The question that matters |
|---|---|
| Validity | Does it cover all your travel days, and when does the clock start? |
| Data | Is the allowance for the whole package or renewed each day? |
| “Unlimited” | Is there a high-speed allowance followed by reduced speed? |
| Hotspot | Can you share data, and are there separate limits? |
| Voice and SMS | What is included, what is charged and what is unavailable? |
| Renewal | Can you add a package, and is automatic renewal enabled? |
For example, 3GB for the trip is very different from 3GB each day. Neither is automatically the better buy: light browsing and maps are a different job from tethering a laptop or uploading large videos.
Staying for two weeks? Choose enough validity for the whole trip: a seven-day package will need a renewal or replacement to cover both weeks. If you are still planning your route, our two-week Vietnam itinerary shows how to divide your 14 days between stops.
Set up the phone before relying on it
Before buying, check that your exact phone model and market variant supports eSIM and is carrier-unlocked. Support can differ between versions of the same phone. If your phone cannot use eSIM, choose a physical SIM instead.
Install the plan over a stable internet connection, following the provider’s app or QR-code instructions. On supported phones, these are the usual starting points:
- iPhone: Settings → Cellular (or Mobile Data) → Add eSIM. Follow Apple’s iPhone setup instructions.
- Android — Samsung Galaxy: Settings → Connections → SIM manager → Add eSIM. Older versions may say “SIM card manager” and “Add mobile plan”; Samsung’s setup guide explains the QR-code option.
- Android — Google Pixel (Google’s phones): Settings → Network & internet → SIMs → Add SIM → Set up an eSIM. See Google’s Pixel setup instructions.
Menu names vary by software version. For another Android brand, use that manufacturer’s instructions. Keep your order confirmation and activation instructions accessible, and do not share the activation code publicly.
Follow your package’s instructions for when to activate it and whether data roaming is required on the travel line. Select that line for mobile data and review automatic data switching. If you keep your home SIM active, switch off data roaming on the home line unless you intend to use it. Home-line calls and texts can still incur charges; confirm those costs and access to bank verification messages with your carrier before leaving.
Once connected, open a normal webpage. If your package includes calls and you need them, test a call too. Fix any problem while provider support or store staff are available.
If your phone cannot use eSIM
If your phone cannot use eSIM, a physical SIM is the practical choice. Arrange your arrival backup first: save the hotel’s address and map offline, and use available airport or accommodation Wi-Fi to locate an official carrier store.
- Bring your passport and confirm the carrier’s registration requirements before going.
- Have Vietnamese dong available. The shop I used in Can Tho did not accept my card, which meant another search for an ATM. That was my experience with one shop; do not assume your chosen store accepts cards.
- Ask for the full price, including the SIM and package, and enough validity for your stay.
- Test it before leaving: open a webpage, check your data balance and expiry, and test calls if they are part of what you bought.
Keep your home SIM safely if you remove it.
Vietnam SIM Card and eSIM FAQ
Can I keep my existing WhatsApp number?
Using a travel data eSIM on the same phone does not require you to register WhatsApp with a new number. Keep the existing account and use the travel line for internet access. Retain access to your registered number in case WhatsApp needs to verify it again; a data-only travel package will not receive SMS sent to your home number.
Can two travellers share one eSIM?
One person may be able to share their connection using the phone’s hotspot, if the device and package allow it. Both people then use the same data allowance and need to stay within hotspot range. If you will split up for sightseeing or need separate rides, individual plans are more practical.
What should I check if the eSIM does not connect on arrival?
Check that you are in a covered destination, the plan is active with data remaining, and the travel eSIM is enabled and selected for mobile data. Apply the provider’s roaming instructions to that line. Use available Wi-Fi to contact support if needed, and do not delete the eSIM as a first troubleshooting step: follow the provider’s reinstall guidance.
Which would I choose for this trip?
After the Can Tho experience, I would arrange a data eSIM before travelling if my phone supported it. For the 5GB example above, I would start with Saily; if I already used Airalo, the one-cent price difference would not persuade me to change.
With a phone that needs a physical SIM, I would prepare the offline hotel details, passport and dong before visiting a carrier store. If the trip crosses borders, I would compare a regional package before buying separate country plans.