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eSIM for Vietnam

Data for Hanoi, Ha Long Bay, Hoi An and Saigon, installed before you fly. Vietnam is a country you cross top to bottom, and the Asia plan keeps the same eSIM working from the first sleeper train to the flight out.

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The Vietnam plan covers Vietnam only.

1 GB7 days1.99€$2.29£1.79CHF 1.893 GB14 days5.29€$5.99£4.59CHF 5.095 GB30 days7.89€$8.99£6.79CHF 7.49Best value10 GB30 days13.99€$15.99£11.99CHF 13.9920 GB30 days24.99€$28.99£21.99CHF 23.9950 GB30 days55.99€$63.99£47.99CHF 52.99
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Crossing borders?

The same 10 GB in a package that keeps working past Vietnam.

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Also on the Asia plan

20 other countries share the package with Vietnam. A few of them:

ThailandJapanArmeniaBangladeshChinaGeorgia

Good to know

What's included, when it starts, and how to get connected.

Included countries
The Vietnam plan covers Vietnam only.
Local networks
In Vietnam your eSIM connects to MobiFone — 4G/5G where the network offers it.
When validity starts
Your package starts when your phone first connects to a network at the destination — not when you install it. Crossing a border does not restart it.
Installation and activation
Install the eSIM while you still have internet — at home or on Wi-Fi. Installation does not start validity. If you already have a onesim eSIM installed, a new package is added to it — no second installation. Setup guide
Calls and texts
onesim is data-only. Calls and messages work over data in apps like WhatsApp or FaceTime; your usual SIM keeps your number.
Support and refunds
Message the onesim support team from the app or the website. If a package cannot be installed or used, the refund policy explains what applies. Refund policy
Route idea · north to south

Two weeks, top to bottom.

Hanoi to Saigon is 1,700 kilometres, and the country is built to be crossed: sleeper trains, cheap flights and buses to everywhere. The line below is an illustration, not a map.

Street life in the old quarter of Hanoi1

Hanoi and Ha Long Bay · Days 1–4

The old quarter for the food and the noise, then a night on a boat in Ha Long Bay or the quieter Lan Ha Bay next door. The bay is three hours by road; the overnight cruise is the right way to see it.

Yellow shophouses and lanterns in the old town of Hoi An2

Hue, Da Nang and Hoi An · Days 5–9

The sleeper train south to Hue, then the Hai Van pass to Da Nang by car or motorbike — the best road in the country. Hoi An is an evening town of lanterns and tailors, with An Bang beach ten minutes away.

The Saigon River and the Ho Chi Minh City skyline at blue hour3

Saigon and the Mekong · Days 10–14

A flight from Da Nang. Ho Chi Minh City for the markets, the war museum and the rooftop bars, then a day or two in the Mekong Delta by boat. Fly out from here.

How the plan fits this route

One package for the whole length of the country: the same allowance in a Hanoi café, on the sleeper train, on the Hai Van pass and in the delta. The Vietnamese networks reach almost everywhere people live, and the gaps — the bay, the pass, the far north — are the same on any SIM. Download the route offline before each leg and the trip has no surprises left in it.

Guide: Vietnam, north to south
Travel notes

Practical things, honestly.

Street life in the old quarter of Hanoi
Getting around

Grab is the taxi, the motorbike taxi and the food delivery.

Order a car or a xe ôm (motorbike taxi) from the app and the price is fixed before you get in — the reason to have data from the moment you land. In Hanoi and Saigon a motorbike taxi is often faster than a car. Trains are booked on the Vietnam Railways site or through an agent; sleeper berths on the popular legs go days ahead.

Money

Dong in large numbers; cash still wins outside the cities.

Cards work in hotels, chain shops and many restaurants in the big cities; street food, markets, drivers and small guesthouses are cash. Notes come in hundreds of thousands, so the 20,000 and 500,000 notes are easy to confuse — check the zeros. ATMs charge a fee and cap withdrawals; the ones at banks are best.

When to come

There is no single dry season — the north, centre and south have their own.

Hanoi is cool and grey in winter and steaming in summer; the central coast gets its rain in October and November; Saigon is dry from December to April. Spring (March–April) and autumn (October–November) work for most of the length of the country. Tết, the lunar new year, closes much of it for a week.

Small things

Cross the road slowly and keep walking.

Traffic in Hanoi and Saigon does not stop for pedestrians; it flows around them. Step off at a steady pace, do not stop or run, and the scooters will find their way past you. It works. Coffee here is strong, sweet and iced, and the egg coffee in Hanoi is worth the queue.

Reading about Vietnam

A long-tail boat throwing up spray below the limestone cliffs at Railay, Krabi

Destination guides

The Banana Pancake Trail in 2026: six countries, four weeks, one eSIM

Bangkok, an island, Angkor, Vietnam, Penang, Singapore and Bali: the classic first trip as it runs now, with the border that closed, the forms that arrived and one data plan.

Junks among the limestone karsts of northern Vietnam at sunrise

Destination guides

Vietnam north to south in two weeks

Hanoi to the Mekong by train and short flights — the 90-day e-visa, the two climates running at once, and the bay worth avoiding the crowds on.

Vietnam questions.

Answers about data, coverage and setup for Vietnam.

Most visitors need an e-visa, applied for online in advance on the official immigration site, unless their passport is on the exemption list; check the current rules before you book. The eSIM has nothing to do with the visa itself, but having data the moment you land means you can pull up the approval, your hotel address and the Grab app before you reach the counter.

Still unsure?Ask us