Do you need a SIM card in Vietnam?
For most travelers, having mobile data in Vietnam is worth it, and it can cost far less than data roaming. AT&T’s International Day Pass and Verizon’s TravelPass each cost US$12 per day, while T-Mobile’s 1-Day International Data Pass costs US$5. By comparison, Viettel currently offers 30-day data plans from VND 150,000 (around US$6). Mobile data makes it easier to book Grab rides, translate menus with Google Translate, and use apps such as MoMo and ZaloPay. Whether you travel during the best time to visit Vietnam or outside peak season, hotel and café Wi-Fi is widely available, so city-based travelers with light data needs can usually manage with a smaller plan.
The best SIM cards for Vietnam: Viettel, VinaPhone, and MobiFone compared
Vietnam has three mobile networks worth considering: Viettel, VinaPhone, and MobiFone. For most travelers choosing a physical SIM, Viettel is the best SIM card for Vietnam because it has the widest coverage. VinaPhone is a strong choice for city trips, while MobiFone makes sense if you are staying mainly in major urban areas. All three offer low-cost tourist SIM cards, so coverage and your itinerary matter more than saving a dollar or two.
Provider | Tourist plan name | Data | Price | Best for |
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Viettel | 30-day tourist SIM | 60 GB | 200,000 VND (~US$7.70) | Traveling around Vietnam |
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VinaPhone | YOLO90 | 1.5 GB/day | 90,000 VND (~US$3.50) | City trips and lower cost |
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MobiFone | TR109 Travel | 4 GB/day | 109,000 VND (~US$4.20) | Shorter, city-focused trips |
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Note: Prices and packages can change. Always check the current offer before buying.
Viettel: Best for travel outside the cities
Viettel is the safest choice if your trip goes beyond Hanoi, Da Nang, or Ho Chi Minh City. Its network reaches further into rural and mountainous areas, including Sapa, the Ha Giang Loop, and parts of the Mekong Delta. If you want one Vietnam 4G SIM card that should work across most of your trip, Viettel is the clear default.
Tourists can buy a Viettel SIM card in Vietnam at official stores and airport counters. Just don’t forget to bring your passport because the SIM needs to be registered in your name.
VinaPhone: Strong city speeds and cheap tourist bundles
VinaPhone works well in Hanoi, Da Nang, and Ho Chi Minh City and is often a little cheaper than Viettel. Its rural coverage is still good, although it can become less reliable in mountainous areas or far from main roads. That makes it a practical choice for travelers spending most of their time in cities or following the main tourist routes. VinaPhone also offers a good range of tourist SIM cards and data-only SIM plans, with options for shorter stays as well as month-long trips. The activation process is usually quick at official stores, and staff can help choose and set up the right data plan before you leave.
MobiFone: Fine for a city-only trip
A MobiFone SIM card in Vietnam is a go-to choice if most of your trip will be spent in larger cities. Coverage is weaker in more remote parts of the country, so it is less suited to trips through northern mountain areas or rural regions. MobiFone currently lists its TR109 travel package with 4 GB of data per day for 20 days. Some travelers also report receiving more marketing SMS than with the other major networks.
How much does a SIM card cost in Vietnam?
A SIM card for Vietnam usually costs around US$6–13, depending on where you buy it and how much data is included. Airport counters charge more for convenience, while official carrier stores in the city tend to have the lowest reliable prices.
Where you buy | Typical price | What to know |
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Airport counter | US$10–13 (≈260,000–340,000 VND) | Convenient, but usually more expensive |
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Official carrier store | From around US$6 (≈150,000 VND) | Usually the best value and properly registered |
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Unofficial phone or street shop | Around US$2–8 (≈60,000–200,000 VND) | Prices vary; registration may not be handled correctly |
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Travel eSIM | From US$3.99 | Buy and install before your trip |
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Airport prices of around US$10–13 were reported at Da Nang in 2026, while Viettel currently lists a 30-day plan with 3 GB per day for 150,000 VND. The SIM card itself may cost extra, so ask for the total before paying.
The SIM card price also depends on the length of the plan and whether calls are included. For most travelers, a SIM card cost of around US$6–8 at an official city store is reasonable.
Important: If you’re traveling in a group and several people need to share one connection, pocket Wi-Fi in Vietnam is also worth considering.
Where to buy a SIM card in Vietnam
You can buy a SIM card in Vietnam at the airport, at official carrier stores, from smaller phone shops, or online before you travel. The best option depends on whether you value convenience, lower prices, or having everything set up before you arrive.
At the airport: Hanoi, Ho Chi Minh City, and Da Nang
SIM cards are available at Noi Bai International Airport (HAN) in Hanoi, Tan Son Nhat International Airport (SGN) in Ho Chi Minh City, and Da Nang International Airport (DAD). Counters are usually in or just beyond the international arrivals area, after baggage claim and customs. Staff generally speak English, and setup takes around 5–10 minutes.
Check whether you are buying from an official Viettel, VinaPhone, or MobiFone kiosk or a third-party stall. Official counters should ask for your passport so the SIM can be registered in your name. If they don’t, the SIM may be registered incorrectly and could later be disconnected.
A Vietnam SIM card at Hanoi airport, or at another major airport, is convenient but usually costs more than buying one in the city.
Official carrier stores and shops in the city
Official Viettel, VinaPhone, and MobiFone stores usually offer the lowest prices and the widest choice of plans. Searching Google Maps for the carrier name plus your location is often the easiest way to find one nearby.
Bring your passport when buying a prepaid SIM card. Staff can usually register it, activate the plan, and check that your data is working before you leave.
Small phone shops and convenience stores also sell SIM cards in Vietnam, but registration is less reliable. If you want a local SIM card with fewer surprises, an official carrier store is the safer choice.
Online before you fly
You can also buy a SIM card for Vietnam online before your trip. A physical SIM can be shipped to you or reserved for collection, but for travelers coming from the US, this is often slower and more expensive than buying one after arrival.
For a more convenient option, you can use an eSIM instead of a physical SIM card, as long as your phone supports eSIM technology. If you’re wondering what an eSIM is, it’s a digital SIM built into compatible phones. You can buy and install it before departure, then activate it when you land without waiting at a counter. If Vietnam is only part of your longer trip, an Asia SIM card or regional eSIM can also cover several countries under one plan.
How to register and activate a SIM card in Vietnam
Getting a SIM card in Vietnam is quick, but there is one step you should not skip: registration. Your SIM needs to be linked to your passport, so at an official counter, staff will usually scan or photograph it, take a quick portrait photo, register the number, and send you a confirmation SMS. In most cases, you are done in under 10 minutes.
If nobody asks for your passport, that is a red flag. The SIM is not being registered to you and may already be linked to someone else’s details. That can lead to it being blocked later, which is the last thing you want if you are halfway through a road trip or somewhere remote.
At the counter:
Hand over your passport and ask for the SIM to be registered in your name.
Let the staff take the required passport and portrait photos.
Wait for the registration or activation confirmation SMS.
Check that calls, texts, or mobile data are working, depending on your plan.
Ask the assistant to load a webpage before you walk away.
You can also check the registration after activation by texting TTTB to 1414 and following the instructions to see the subscriber details linked to your number. If the information does not match yours, go back to an official carrier store and have it corrected.
Will your US phone work with a Vietnam SIM card?
Most newer US phones will work in Vietnam, but make sure you check three things before you buy a SIM.
Make sure your phone is carrier-unlocked. A phone still locked to AT&T, Verizon, T-Mobile, or another provider will not accept a Vietnamese SIM, even if the network itself is compatible.
Next, check your phone’s supported LTE bands. Vietnamese mobile networks use frequencies including 900 MHz, 1800 MHz, and 2100 MHz, corresponding to LTE Bands 8, 3, and 1. Support varies by phone model and carrier, so check the specifications for your exact device before traveling.
Finally, check whether your phone supports eSIM. Doing so is key if you want to keep your US number active. With a single physical SIM slot, removing your US SIM usually means calls and texts to that number will not reach you while it is out of the phone. A dual-SIM phone or eSIM lets you keep both lines active, so you can still receive verification codes and important messages while using Vietnamese mobile data.
Vietnam SIM card options compared: A local SIM, eSIM, or roaming
For most travelers, a travel eSIM is the easiest option, while a local travel SIM card for Vietnam is better if you need a Vietnamese number or a lot of data for a longer stay. Roaming works for very short trips, but it is usually the most expensive choice. A pocket Wi-Fi can make sense for groups who want to share one connection.
Option | Typical cost | Best for | Trade-off |
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Local prepaid SIM cards (Viettel, VinaPhone, MobiFone) | US$5–13 | Long stays, heavy data use, local number | Passport registration, queue on arrival, unlocked phone needed |
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Travel eSIM, such as Saily | From ~US$4 | Most travelers; set up before you fly | Data only, no local number; eSIM-capable phone needed |
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US carrier roaming | Day-pass pricing | Very short trips, keeping your US number simple | Usually the most expensive option |
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Pocket Wi-Fi | Daily rental | Groups sharing one connection | Extra device to carry, charge, and return |
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If you only need a Vietnam data SIM for maps, rides, messaging, and browsing, an eSIM is usually enough. An international SIM card for Vietnam can also work, but prices and data allowances vary widely.
Consider an eSIM for Vietnam instead
If your phone supports eSIM technology, it’s often the easiest way to get mobile data in Vietnam. An eSIM is simply a digital SIM already built into your phone. There is no plastic card to swap, no store visit, and no need to keep track of your US SIM while you travel.
You can set up an eSIM for Vietnam before you leave home, and it will switch on automatically when you reach your destination. That means you can message your hotel, check the route into the city, or translate something straight away instead of looking for a SIM counter after a long flight.
The trade-off is worth knowing. Some travel eSIMs are data-only, so you will not get a Vietnamese phone number. If you are staying for a month or longer, making a lot of local calls, or using a service that requires a local number, a physical SIM may still make more sense. For a typical one- or two-week holiday, though, most of what you need — maps, messaging, bookings, ride-hailing, and translation — already happens through apps.
That is one of the biggest benefits of an eSIM: having less things on your mind to sort out when you arrive. When comparing an eSIM vs. a physical SIM card, the choice is mostly between convenience and having a local number.
Saily is a great option for Vietnam. You can install it before your trip, choose a plan based on how long you are staying, and get 24/7 support through the app. It also includes built-in security features. Traveling beyond Vietnam? The Asia and Oceania eSIM plan can cover countries such as Thailand, Cambodia, and Laos as well.
Quick recap: How to stay connected in Vietnam
If you’re staying for a month or longer, need a Vietnamese number, or want a lot of data for a low price, a local Viettel SIM is usually the best SIM card in Vietnam. Roaming only really makes sense for a very short trip when you would rather pay more than change your setup.
However, if you want to keep things simple when traveling, an eSIM is the easiest choice for most trips. Download Saily and install an eSIM before you travel.
