Destination guide · Vietnam

eSIM for Vietnam

Vietnam's cities are well covered, but the mountain north and long overland routes are a different story. Here is what to check before you pick a plan.

Four networksViettel widest reach

Cities and coastGood 4G, 5G growing

MountainsSignal weakens

Choosing a plan

What size plan does a Vietnam trip need?

Trip shape	Who it suits	Typical validity
City break	Hanoi or Ho Chi Minh City — maps, ride-hailing, messaging	3–5 days
Coastal and islands	Beach bases and island stays, where hotel wifi can be patchy	7–14 days
Overland and mountains	Long bus and rail legs, and mountain routes where signal comes and goes	10–21 days
Long stay	Multi-week stays, or working remotely from one base	30 days+

Allowances and validity windows are set by the carriers and change without notice. Use this table to size your plan, then confirm the current details on the carrier's own page before you buy.

Before you buy

✓ Check whether your route crosses the northern mountains, and size your data for the quiet stretches
✓ Download offline maps before you fly — long bus and train legs frequently have no usable signal
✓ Confirm your phone supports eSIM and is not carrier-locked to your home network
✓ Decide whether you need hotspot sharing if you are travelling with a laptop
✓ Keep your own SIM active if you need to receive bank or login codes

In Vietnam the places you most want a map — mountain passes, overnight trains, the road to a ferry — are often the places with the weakest signal. Offline maps and a little extra data are worth arranging before you leave rather than during the journey.

Networks and coverage

How the networks behave in Vietnam

Vietnam runs on four mobile networks — Viettel, Vinaphone, Mobifone and Vietnamobile — and they are not interchangeable. Viettel has the widest national reach, including the remote provinces and mountain districts where the others thin out, so if your itinerary goes well beyond the cities it is the network you want to be on. In Hanoi, Ho Chi Minh City and Da Nang, 4G coverage is good and 5G is being rolled out across the major cities, and the coastal tourist areas are generally well served. The gaps are predictable rather than random: signal weakens in the northern mountains around Sapa and Ha Giang, some of the islands are thinly covered, and long-distance buses and trains run through stretches with no usable signal at all. If your trip involves mountain roads or a lot of overland travel, plan for those quiet stretches — download offline maps before you go and carry more data than a city-only trip would need.

Installation

Installing before you fly

Buy and receive your code

Complete the purchase on the carrier's page and receive your installation code by email.

Install at home on wifi

Add the plan as a second line while you still have reliable internet — this removes the arrival-day scramble entirely.

Switch data on when you land

Select the travel eSIM for mobile data on arrival, and keep your own line enabled for calls and messages.

Where to buy

Check current plans

View plans on Saily View plans on Airalo View plans on Yesim

Plans and prices are set by the provider and change without notice. You complete the purchase on their site — we never handle your order or payment.

Vietnam FAQ

Questions specific to Vietnam.

Which network will my eSIM actually use in Vietnam?

The names are not equivalent, so it is worth knowing which one your plan connects to. Viettel has the widest national reach, including remote provinces and mountain areas, while Vinaphone, Mobifone and Vietnamobile serve the cities and main tourist routes well. If your itinerary stays on the beaten track the difference will rarely show; if it goes well outside the cities, check the network behind the plan before you buy.

Will I have signal in Sapa or Ha Giang?

Expect it to weaken. The northern mountains are where Vietnamese coverage is thinnest, and even on the widest-reaching network signal comes and goes along the passes and in the valleys. Download offline maps before you set out and treat connectivity there as intermittent rather than guaranteed.

Does mobile data work on long-distance buses and trains?

Only in bursts. Coverage along the main overland corridors is not continuous, so a long bus or rail journey usually means extended stretches with no usable signal. Download what you need — maps, tickets, translations — while you still have a connection rather than assuming you can look it up en route.

Is hotel wifi reliable enough to skip a data plan?

Not as your only connection. Wifi quality varies widely between properties, and the moments you most need to look something up — arriving at a bus station, confirming a booking, finding a driver — tend to happen outside the hotel. A data plan you can rely on is worth more here than in a country where you would be on wifi anyway.

Other destinations

China eSIM Thailand eSIM Singapore eSIM Destinations

Start here

Pick your destination, compare the plans.

Every plan we list links directly to the carrier. You buy from them, at their price, with their support.

Browse destinations How we earn