Best eSIM for Vietnam for Australians: What to Know Before You Fly

Roamza sells travel eSIMs for Vietnam, and this guide helps you choose the right one for your trip. You buy before you fly, install at home over Wi-Fi, and switch on when you land — ready to use Grab, translate menus and navigate Hanoi's Old Quarter without roaming charges.

Getting around Vietnam with data

Vietnam's cities move fast. Grab is the dominant ride-hailing app — you'll use it for motorbike taxis in Hanoi's narrow streets and cars in Ho Chi Minh City's wide boulevards. Google Translate helps with menus, signs and conversations. Google Maps gets you between districts, to train stations and to overnight bus pick-up points.

All of these need a data connection. Free Wi-Fi exists in many hotels and cafes, but it's patchy on overnight trains, in the highlands and on coastal roads.

The local SIM registration requirement

Vietnam requires SIM cards to be registered. If you buy a local SIM card at a shop or airport, you'll need to present your passport for registration. A travel eSIM bought and installed before departure means you skip this process at a Vietnamese shop — your eSIM is ready to go before you land.

Do you need data in Vietnam?

For most travellers, yes. The apps you'll rely on — Grab, Google Maps, Google Translate and WhatsApp — all want a connection. Navigation in Hanoi and Ho Chi Minh City uses roughly 120–150MB per hour of active routing. Translation apps use data when downloading language packs or doing live camera translation.

Choosing a Vietnam eSIM

Roamza's current Vietnam plans are unlimited daily eSIMs, available in 1-day, 2-day, 3-day and 4-day durations starting from $4.95. Each day you get 1GB of high-speed data, followed by unlimited data at a reduced speed.

For a short city break, the 1-day or 2-day plan is enough. For a typical week-long trip, the 3-day or 4-day plan covers you, and you can combine plans for longer stays.

You can see the current Vietnam eSIM plans here.

How Fair Use works on Vietnam plans

Each day, you get 1GB of high-speed data — enough for maps, messaging, Grab and translation. After that, you stay connected at up to 384kbps, which is enough for messaging and basic browsing but not for video streaming.

This means you don't have to worry about running out of data — you just get a slower speed after your daily high-speed allowance. Read more on the Fair Use page.

Network coverage in Vietnam

Roamza's Vietnam eSIMs connect to major Vietnamese networks including Viettel, Vinaphone and MobiFone. Coverage is strong in cities like Hanoi, Ho Chi Minh City and Da Nang, and along major highways. Coverage can be thinner in the highlands and on remote coastal roads.

The plans support 4G networks, with 5G available in some locations depending on the network and your device.

Setting up before you fly

Install your eSIM at home over Wi-Fi a day or two before you fly — it takes under two minutes. The eSIM sits inactive until you land and switch it on. For step-by-step instructions, see the installation guide.

On a compatible dual-SIM phone, you can keep your Australian SIM installed for calls and SMS while using the eSIM for data. Check the compatibility checker to confirm your phone supports dual SIM.

Your Australian carrier may offer international roaming, but it can be expensive — check your carrier's current roaming rates before travelling. See how it works for more on travel eSIMs vs roaming.

Roamza's plan options and prices can change. Check the Vietnam plans page for current availability.