Vietnam SIM card, eSIM or roaming: what to buy and where

Local SIM, eSIM or roaming: which is cheapest for a Vietnam trip?

For a 10-day trip, a local tourist SIM costs about 6 to 10 USD, a data eSIM about 11 to 25 USD, and roaming from Australia about A$50 to A$100 or more on a daily pass. Singapore travellers pay least if their plan already includes Asia roaming data.

Sources: carrier price lists and roaming pages as reported by WhistleOut, Holafly and Singtel; prices checked October 2026. Telstra's day pass price for Vietnam differs by plan, so confirm in the My Telstra app.

The trap is pay-per-use. Without a pass, Singtel charges about S$25 per MB in most countries, and older Australian plans bill by the megabyte too, so switch data roaming off before the plane lands unless a pass is active. Many travellers keep their home SIM in the phone for bank codes and add a Vietnamese SIM or eSIM for data, which modern dual-SIM phones handle without trouble.

How much does a Vietnam tourist SIM cost?

A Vietnam tourist SIM costs about 60,000 VND for 7 days and 120,000 to 200,000 VND for 30 days with 1.5 to 6 GB of high-speed data a day, bought at a city store. Airport counters sell bundled tourist packs for roughly 250,000 to 500,000 VND, about 30 to 40% more for similar data.

Sources: Viettel and VinaPhone tourist plan lists published by resellers, prices checked October 2026. Plan codes change often; ask for "5 GB a day for 30 days" rather than a code. The SIM card itself may add a small fee.

Once you pass the daily cap, speed drops sharply but does not stop, which is still enough for messages but slow for maps. Buying a plan with a larger daily allowance usually costs only 30,000 to 50,000 VND more over a month. Data ends up as one of the smallest lines in a Vietnam travel budget, so there is little reason to choose the slowest plan.

Which network is best in Vietnam: Viettel, VinaPhone or MobiFone?

Viettel is the best choice for most visitors because it has the widest coverage, including mountain areas such as Sapa and the Ha Giang Loop. VinaPhone is strong in cities, MobiFone works well on southern routes, and Vietnamobile is cheap but weak outside city centres.

5G is no longer limited to a few downtown blocks. Viettel and VinaPhone launched commercial 5G in late 2024 and MobiFone in 2025, and by early 2026 the three had about 40,000 5G stations covering roughly 90% of the population, according to Vietnam's telecom authority. Most new tourist SIMs are 5G-ready; you need a 5G phone to use it, and 4G covers almost everywhere else.

Can you buy a SIM card at Vietnam's airports?

Yes. Viettel, VinaPhone and MobiFone run counters in the international arrivals halls at Noi Bai (Hanoi), Tan Son Nhat (Ho Chi Minh City), Da Nang, Cam Ranh and Phu Quoc, usually open for every arrival. Bring your passport: staff photograph it and take a live photo of your face to register the SIM.

Under Decree 163/2024, in force since 24 December 2024, a SIM can only work once it is registered to a passport valid for your stay, with a time-stamped portrait photo. That makes pre-activated SIMs sold by drivers or street stalls illegal, and they tend to get cut off. Our team at Noi Bai sees the same thing most evenings: travellers buy at the first counter past customs, while the same data costs about a third less in town. The SIM counters sit after immigration, so how long the passport queue takes decides how long you wait; an airport fast track shortens that part if you land at a busy hour.

Book airport fast track

Choose a counter with a carrier's own branding, not a generic "Tourist SIM" sign, and check that the data works before you walk away. If you buy a second Vietnamese SIM later, the carrier may verify it with a one-time code or a short video call.

Physical SIM or eSIM: which works better in Vietnam?

A physical SIM gives you a +84 Vietnamese number and the cheapest data, but needs a passport check at a counter. An eSIM installs by QR code before you fly and keeps your home SIM in place, but most travel eSIMs are data only.

Do you need a +84 number? Grab works with an Australian or Singapore number if you register the app before you leave home. A local number helps when drivers, homestays or tour guides want to call you, and some local apps and Zalo groups expect one. If your phone was bought on a contract, check it is unlocked before you travel.

How much data do you need, and can you share it?

Most travellers use 1 to 2 GB a day for maps, ride-hailing, messaging and photos, so a plan with 4 to 5 GB a day covers heavy users and video calls. All three major networks allow hotspot sharing, so one SIM can serve a couple or a family.

Hotspotting drains the daily allowance quickly when laptops or tablets update in the background, so turn off automatic updates on shared devices. On Viettel, text KTTK to 191 to check your balance. Free Wi-Fi is common in hotels and cafes, but slower in homestays and on long bus rides.

Which apps should you set up with your SIM?

Set up Grab (or Be and Xanh SM) for rides and food, Zalo for messaging hotels and guides, Google Maps with offline areas downloaded, and a translation app. Link a credit card to Grab so you rarely need exact change.

Zalo is Vietnam's main messaging app, and many homestays, rental shops and drivers prefer it to WhatsApp. QR code payment is everywhere, but local wallets such as MoMo need a Vietnamese bank account, so plan to pay with cash or a card; our guide to Vietnam currency covers ATMs and when cash is still needed. To top up your SIM, buy a scratch card (thẻ cào) at Circle K, WinMart or FamilyMart and dial *100*, followed by the code and #.

What do Vietnamese carrier text messages mean?

Carriers send alerts in Vietnamese, usually about data running out, a low balance or missing registration details. The registration warning is the one to act on: visit an official store with your passport, or your line can be suspended. Text TTTB to 1414 (free) to check the details registered to your number.

Vietnam SIM card FAQ

Do I need a SIM card in Vietnam?

Not strictly, since hotels and cafes have Wi-Fi, but data makes Grab, maps and translation work on the street, and it costs about 6 USD for a month. Most visitors find it worth it from day one. Our Vietnam travel tips cover the other things to sort out before you fly.

Can I buy a Vietnam SIM before leaving Australia or Singapore?

Yes, as an eSIM from an online provider, which you install at home and switch on when you land. Physical Vietnamese SIMs sold online abroad still need registering to your passport, so buying on arrival is simpler.

Will my Vietnam SIM work in Cambodia or Laos?

Usually not at a fair price; roaming on a Vietnamese tourist SIM is expensive. If your trip crosses borders, a regional Asia eSIM or a new local SIM in each country costs less.

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