Can I use the eSIM the moment I reach the Hanoi and Ho Chi Minh City airports?

Yes. If you install your Yeohaengyusim eSIM before departure, you connect automatically to the Viettel network right after landing at Noi Bai International Airport (Hanoi) or Tan Son Nhat International Airport (Ho Chi Minh City). You can use the Grab app and Google Maps right away, with no need to look for airport Wi-Fi or queue at a local SIM counter.

Does data work on a Ha Long Bay cruise or while trekking in Sapa?

On the Ha Long Bay cruise routes, 4G LTE tends to connect at the main anchorages around the islands, but in remote spots in the middle of the bay the signal can weaken. On the Sapa trekking routes you get a data connection in the village centres, but on trails deep in the mountains coverage can be unstable. If you download offline maps in advance, finding your way is easy even in mountain areas.

Do I really need data to use Grab in Vietnam?

Yes. In Vietnam, Grab is the most widely used way to get around instead of taxis. The Grab app does it all, from ride-hailing to motorbike taxis (GrabBike) and food delivery. The app needs a live internet connection to run, so you need data connected from the moment you step out of the airport to get around comfortably. With a Yeohaengyusim eSIM you are connected as soon as you land, so there is nothing to worry about.

Is coverage all right in the central and southern cities too, such as Da Nang, Nha Trang and Hoi An?

Viettel is Vietnam's largest carrier and provides reliable 4G LTE in the main tourist cities such as Da Nang, Nha Trang, Hoi An and Da Lat. Data tends to work well in the beach resort area of Da Nang and in the old town of Hoi An too. Just bear in mind that coverage can drop in mountain areas or near remote ethnic minority villages.

Vietnam's sockets are different from Korea's, so isn't charging inconvenient?

Vietnam uses a mix of Type A, B and C sockets. Some sockets fit a Korean plug (Type C or Type SE), but depending on your accommodation you may need an adapter. If you pack a multi-adapter before departure, you can charge your smartphone anywhere with peace of mind. You can buy an adapter at a large shopping mall or convenience store too, but it is easier to have one ready in advance.

Does eSIM work in Vietnam?

Vietnam supports eSIM, and plans start from ₩2,396. Install it with the QR code you receive after buying, then just turn on data roaming after you arrive and you are connected straight away. There is no need to swap your SIM.

Travel eSIM or carrier roaming: which is cheaper for a trip to Vietnam?

For a short trip or light data use, a travel eSIM is usually cheaper. Unlimited roaming from Korean carriers costs about ₩11,000–₩15,000 a day, but with an eSIM you can buy just the days of data you need in advance. For a short trip for one or two people, an eSIM has a big advantage; for a family or very heavy data use, compare carrier unlimited roaming too.

Can I keep using my Korean number while travelling in Vietnam?

Yes. The eSIM works as a data-only second line, so your Korean SIM and number stay as they are. Use the Yeohaengyusim eSIM for data only, and keep receiving calls, texts and KakaoTalk on your Korean number.

Can I add to or extend my Vietnam eSIM plan?

Yes. When you use up your data or the plan period ends, you can buy a new plan at any time. Keep using the eSIM profile you already installed; there is no need to install it again, so you carry on without interruption.

Can I use tethering (hotspot) in Vietnam?

Yes. In Vietnam you can share your eSIM data with other devices such as a laptop or tablet by tethering (hotspot). Shared data also comes out of your plan allowance, so if you tether a lot we recommend choosing a little more data.

Do I set up the eSIM before I leave or after I arrive?

We recommend installing it (registering the QR code) before you leave, while you have Wi-Fi. Data starts when you turn on data roaming after you arrive in Vietnam. Just remember "set up before you leave, switch on when you arrive" and you can use the internet as soon as you land.

How many GB of data do I need for a trip to Vietnam?

For mostly maps and messaging, we recommend about 1 GB a day; to use plenty of social media and photo uploads, about 2 GB a day. If you stream a lot of video or tether a lot, an unlimited plan is better. You can always buy more if you run short, so it is fine to choose a little extra at first.

Vietnam eSIM plans

Instant delivery

A travel eSIM for Vietnam starts from ₩2,396 and works as soon as you buy it. In Vietnam it connects automatically to local networks such as Viettel · Mobifone · Vinaphone (VNPT) (4G/LTE, 5G where supported), with population coverage of about 85%. Install it with the QR code before you leave and you can use the internet as soon as you land, with no roaming setup. The Viettel network stays stable as far as Da Nang and Nha Trang, and large-data plans are available.

Sent instantly by email
30-day refund
Customer support in Korean
Credit card · Apple Pay

Vietnam eSIM at a glance

Price: From ₩2,396
Local networks: Viettel · Mobifone · Vinaphone (VNPT)
Network: 4G/LTE
Activation: QR code — install before you leave
Recommended data: Maps and messaging 1 GB a day · more room 2 GB a day · video: unlimited

eSIM plans you can use in Vietnam

Data	Validity	Price
Unlimited	1 day	₩2,396
Unlimited	3 days	₩8,272
Unlimited	5 days	₩13,546
Unlimited	7 days	₩18,067
Unlimited	10 days	₩24,847
Unlimited	15 days	₩36,902
Unlimited	30 days	₩71,558
1 GB	7 days	₩3,752
2 GB	15 days	₩5,259
3 GB	30 days	₩7,519
5 GB	30 days	₩10,533
10 GB	30 days	₩19,573
20 GB	30 days	₩30,121
50 GB	30 days	₩49,709

Vietnam is a gem of Southeast Asia that travellers from Korea come back to year after year. The quiet old-quarter alleys of Hanoi, the dazzling My Khe Beach in Da Nang, the energetic night streets of Ho Chi Minh City, and the World Natural Heritage site of Ha Long Bay — from north to south, each place is full of its own charm. Starting the day with a bowl of pho or a banh mi is a pleasure unique to travelling in Vietnam. But if you get lost in an unfamiliar city, or need to call a Grab and the internet is down, all that pleasure can turn into stress. If you install your Yeohaengyusim eSIM before departure Korea, you are connected right after landing at Noi Bai Airport or Tan Son Nhat Airport. No SIM swap, no queuing at an airport stand — you can enjoy every moment of Vietnam to the full.

Flight time from Korea

About 4–5 hours (direct flight)

Time difference

2 hours behind Korea (UTC+7, KST-2)

Best season to go

Central and north November–April, south December–April (dry season)

Plug type

Mix of A/B/C (adapter needed)

Why you really need a travel eSIM for Vietnam

Vietnam is a country that stretches a long way from north to south, so many trips involve moving between several cities. As you travel from Hanoi through Da Nang to Ho Chi Minh City, a reliable data connection is a must, not an option. Checking train timetables, looking up accommodation check-in details, finding an alleyway restaurant on Google Maps, calling a motorbike taxi with Grab — it is a destination where it is hard to get through even a day without your smartphone. You can buy a SIM locally in Vietnam too, but finding the plan you want at an airport stand or convenience store and communicating in English or Vietnamese is more of a hassle than you would think. A Yeohaengyusim eSIM can be bought conveniently in Korea before departure, and installed with a single QR code scan. Through the Viettel network it covers about 85% of Vietnam, and at 4G/LTE speeds the connection holds in most areas, even on a Ha Long Bay cruise boat or along a Sapa trekking route. Leave your existing Korean SIM as it is and activate only the eSIM for data, and you will not miss calls or verification texts from Korea either. Start getting ready for a freer, more convenient trip to Vietnam with a Yeohaengyusim eSIM.

Network coverage in Vietnam

Carrier

Viettel

+ Mobifone

Network

4G/LTE

Coverage

85%

How do I install a Vietnam eSIM?

1
Buy a plan
Choose a data plan for Vietnam and complete payment.
2
Scan the QR code
Open the email we sent and point your phone camera at its QR code.
3
Install the eSIM
Complete the eSIM installation as prompted. Doing it before you leave is simplest.
4
Connect on arrival
Once you land in Vietnam, switch data roaming on and you're online.

1
Buy a plan
Choose a data plan for Vietnam and complete payment.
2
Scan the QR code
Open the email we sent and point your phone camera at its QR code.
3
Install the eSIM
Complete the eSIM installation as prompted. Doing it before you leave is simplest.
4
Connect on arrival
Once you land in Vietnam, switch data roaming on and you're online.

Which plan is right for me?

Short trip

For a short 3–7 day trip, an unlimited data plan is ideal.

Business trip

We recommend a high-data plan with plenty for video calls and email.

Long stay

Staying a month or more? A large-data plan gives the best value.

Family trip

Families sharing a connection across multiple devices should pick a tethering-enabled plan with a generous data allowance.

eSIM, local SIM or pocket Wi-Fi: what suits a trip to Vietnam best?

	eSIM	Local SIM	Pocket Wi-Fi
Activation	Instant (QR code)	Buy locally	Pick up / delivery
Setup	2 minutes	SIM swap needed	Separate device
Price	From ₩2,396	₩10,000~50,000	₩5,000~15,000/day
Network	Local 4G/LTE	Local 4G/LTE	Local 4G/LTE
Devices	1 smartphone	1 smartphone	Up to 5
Flexibility	Top up any time	Fixed data	Daily rental
Best for	Ideal for travellers	Long stays	Families / groups

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