Vietnam eSIM: Stay Online from Hanoi to Ha Long Bay
Skip the SIM kiosks and land in Vietnam already connected. Here is how an eSIM keeps you online on real local 4G/5G networks.
Stepping off the plane in Vietnam, you want maps, ride apps and messages working before you even reach the taxi rank. An eSIM makes that happen the moment you land.
Why use an eSIM in Vietnam
A Vietnam eSIM is a digital SIM you install before you travel. No queuing at the airport, no passport registration desk, no swapping tiny plastic cards.
Activates instantly with a QR code
Keeps your home number live for calls and texts
Runs on fast local data, not expensive roaming
Lets you keep one app for maps, Grab and translation
Vietnam has excellent, affordable mobile coverage. eSIMs connect to the major operators Viettel, Vinaphone and MobiFone.
Viettel has the widest reach, strong even in rural and mountain areas
4G is fast and nationwide; 5G is live and expanding in big cities
Solid signal in Hanoi, Ho Chi Minh City and Da Nang
Coverage stays reliable along the coast and in tourist hubs like Hoi An and Nha Trang.
How to get connected
1. Buy your eSIM online and check your phone shows as eSIM-compatible
2. Scan the QR code we email you and install the profile
3. Turn on data roaming for the eSIM line when you arrive and you are online
How much data do you need
Light use (maps, chat, email): 1 GB per week
Everyday travel (social, browsing, some maps): 3-5 GB
Heavy use (video, hotspot, lots of uploads): 10 GB or more
Wi-Fi is common in hotels and cafes, so most travelers do well with a mid-size plan.
Good to know
Currency: Vietnamese dong (VND)
Capital: Hanoi
Language: Vietnamese
Time zone: Indochina Time (UTC+7)
Famous places: Ha Long Bay, the old town of Hoi An, and the Cu Chi Tunnels near Ho Chi Minh City
FAQ
Will my phone work with an eSIM?
Most recent iPhones, Samsung Galaxy, Google Pixel and other flagship phones support eSIM. Check Settings for an Add eSIM option before you buy.
When should I install it?
Install at home over Wi-Fi before you fly. It only activates once you connect in Vietnam, so your days are not wasted.
Can I keep my WhatsApp number?
Yes. WhatsApp is tied to your existing number, which stays active. You just get cheap data from the eSIM.
Yes. Vietnam's major carriers support eSIM, so a HelloSIM eSIM connects to a local partner network as soon as you arrive, provided your phone is eSIM-capable and carrier-unlocked.
Is my phone compatible with a HelloSIM eSIM for Vietnam?
Most phones from 2019 onward support eSIM, including iPhone XS and newer, Google Pixel 3 and later, and recent Samsung Galaxy S and Note models. Your phone must also be unlocked to use a HelloSIM eSIM in Vietnam.
How do I check that my iPhone supports eSIM before my Vietnam trip?
Go to Settings, General, About and look for a Digital SIM or EID, or open Settings, Cellular and check for Add eSIM. If those appear, your iPhone can install a HelloSIM eSIM for Vietnam.
Which networks does HelloSIM use in Vietnam?
HelloSIM connects through Vietnam's biggest operators, primarily Viettel (the largest with the widest reach) and also Vinaphone and Mobifone. Your eSIM automatically registers on the strongest available partner network.
How do I buy and install a HelloSIM eSIM for Vietnam?
Buy the Vietnam plan on the HelloSIM website or app and receive a QR code by email. Scan it in your phone's eSIM settings and the profile installs in about a minute, before you leave home.
How do I install the Vietnam eSIM using the QR code?
On iPhone go to Settings, Cellular, Add eSIM, Use QR Code and scan the HelloSIM code. On Android open Settings, Network and internet, SIMs, Add eSIM and scan the same code.
Can I install the Vietnam eSIM without a QR code?
Yes. HelloSIM also provides manual activation details, an SM-DP+ address and activation code, that you can type into the Add eSIM screen if you cannot scan the QR code.
Should I activate my Vietnam eSIM before flying or after I land?
Install it before you fly over Wi-Fi, but many HelloSIM plans start their validity when the eSIM first connects in Vietnam. Check your plan's terms so your days are not consumed during travel.
Will my eSIM work the moment I land in Vietnam?
Yes. With the eSIM installed and data roaming enabled for it, it connects automatically at airports like Tan Son Nhat in Ho Chi Minh City or Noi Bai in Hanoi, giving you data right off the plane.
Do I get 5G with a HelloSIM eSIM in Vietnam?
Viettel and Vinaphone have launched 5G in major cities, and HelloSIM eSIMs can use 5G where it is live and your phone supports it. Elsewhere you connect on fast, widely available 4G/LTE.
How good is 4G coverage across Vietnam?
4G/LTE coverage is excellent in Hanoi, Ho Chi Minh City, Da Nang and along the main tourist corridors. Remote mountain and island areas may be slower, but populated regions are very well served.
How much data do I need for a week in Vietnam?
For a week of maps, messaging, social media and light browsing, most travelers are fine with 3 to 5 GB. If you stream video or use a hotspot, consider 8 to 10 GB or an unlimited-style plan.
How much data should I get for two weeks in Vietnam?
Two weeks of typical use usually fits in 8 to 15 GB. Heavy users who stream, video-call or tether a laptop should choose a larger allowance or top up as they go.
What do eSIM data plans for Vietnam typically cost?
Prices depend on data volume and validity, but short traveler plans generally fall in a modest single-to-low-double-digit dollar range. Check the HelloSIM Vietnam page for current pricing rather than a fixed figure.
How long are HelloSIM Vietnam plans valid?
Validity depends on the plan, commonly ranging from about 7 days up to 30 days. Pick a plan whose validity comfortably covers your entire trip so it does not expire mid-visit.
Can I use my HelloSIM eSIM as a hotspot in Vietnam?
Yes. HelloSIM Vietnam plans support tethering, so you can share your connection with a laptop, tablet or travel companion. Hotspot use draws from the same data allowance.
Can I keep my home phone number while using the eSIM in Vietnam?
Yes. The eSIM runs alongside your physical SIM in dual-SIM mode, so your home number stays active for calls and texts while the HelloSIM eSIM handles your data in Vietnam.
How do I avoid roaming charges on my home SIM in Vietnam?
Keep data roaming off on your home SIM and set the HelloSIM eSIM as your default data line. Your data then runs through HelloSIM and your home carrier will not bill you for roaming.
Do I need to change APN settings for my Vietnam eSIM?
Usually not. HelloSIM sets the correct APN automatically. If data does not work, HelloSIM provides the APN to enter manually in your cellular data settings for the eSIM.
I have signal but no internet in Vietnam. What should I check?
Confirm data roaming is on for the HelloSIM eSIM, that it is selected as your data line, and that the APN is correct. Toggling airplane mode or restarting the phone usually restores the connection.
My Vietnam eSIM is not registering on a network. What do I do?
Restart your phone, then manually select an operator such as Viettel instead of automatic. If it still fails, make sure your phone is unlocked and the correct plan's eSIM was installed.
Can I top up my HelloSIM eSIM if I run out of data in Vietnam?
Yes. You can buy more data in the HelloSIM app or website without removing your eSIM. Top-ups apply to the same profile, so there is nothing to reinstall.
Does the eSIM include calls and SMS in Vietnam or is it data-only?
HelloSIM plans are primarily data-only. You can still call and message using internet apps like WhatsApp, Zalo, FaceTime or Messenger, which is how most travelers stay in touch in Vietnam.
What is the emergency number in Vietnam?
In Vietnam dial 113 for police, 114 for fire and 115 for ambulance; 112 also works for general emergencies. These calls work even on a data-only eSIM through your phone's dialer.
Can I use my Vietnam eSIM in nearby countries like Thailand or Cambodia?
A single-country Vietnam plan covers only Vietnam. For a Southeast Asia trip, choose a HelloSIM regional plan or install a separate eSIM for each country you visit.
Is there a regional Asia eSIM that covers Vietnam?
Yes. HelloSIM offers regional plans that bundle several Asian countries. If you are touring beyond Vietnam, a regional eSIM can be more convenient than buying single-country plans separately.
Will the eSIM work in Da Nang, Hoi An and Ha Long Bay?
Yes. Coverage is strong in Da Nang, Hoi An, Nha Trang and around Ha Long Bay. These popular destinations sit on well-served parts of the Viettel and Vinaphone networks.
What download speeds can I expect in Vietnam?
On 4G in cities you can typically expect a comfortable tens of megabits per second, faster where 5G is live. Speeds dip in remote highlands or on boats, but stay fine for maps and messaging.
Do I need to register my passport to use an eSIM in Vietnam?
No. Unlike buying a local physical SIM, which requires passport registration, a HelloSIM eSIM needs no in-country paperwork. You buy it online and it works when you arrive.
Can I buy the Vietnam eSIM after I have already arrived?
Yes, as long as you have some internet such as airport or hotel Wi-Fi to receive and scan the QR code. Buying before you fly is easier, but last-minute purchase also works.
How many eSIM profiles can I keep on my phone for a multi-country trip?
Modern iPhones and many Android phones store several eSIM profiles and keep two active at once. You can install your Vietnam eSIM alongside others and switch between them in settings.
What happens to my eSIM when the Vietnam plan expires?
When the data or validity runs out the eSIM simply stops carrying data. You can top up to keep using it or delete the profile. Expired plans do not incur surprise charges.
Can I get a refund if the Vietnam eSIM does not work?
HelloSIM supports customers whose eSIM will not activate, usually troubleshooting first and considering a refund for an unused eSIM that cannot be made to work. Contact support before or during your trip if possible.
Is an eSIM cheaper than roaming with my home carrier in Vietnam?
Almost always. Home-carrier roaming in Vietnam can cost several dollars per day or high per-megabyte rates, while a HelloSIM travel eSIM gives you a set data bundle at a predictable, usually far lower price.
Will running the eSIM drain my battery faster in Vietnam?
Using two SIM lines can slightly increase battery use. To save power, disable your unused physical SIM line and rely on the HelloSIM eSIM for data while you travel.
Can I use ride-hailing and maps apps on the Vietnam eSIM?
Yes. Apps like Grab, Google Maps and food-delivery services run well on your eSIM data, which is a major reason travelers keep a connection throughout their stay in Vietnam.
Should I download offline maps before arriving in Vietnam?
It is a smart backup. Download offline maps of Hanoi, Ho Chi Minh City and your route in Google Maps or Maps.me over Wi-Fi so you can navigate even where coverage is weak.
Is it safe to buy an eSIM online for Vietnam before my trip?
Yes. Buying a HelloSIM eSIM in advance is a common, secure way to guarantee connectivity on arrival. You install it at home and switch it on once you land in Vietnam.
What language and currency will I encounter using services in Vietnam?
Vietnamese is the main language and the dong is the currency, though your HelloSIM plan is bought online in your own currency in advance, so you need no local cash to get connected.
Can two people share one Vietnam eSIM?
An eSIM lives on one phone, but you can share its connection via hotspot so a companion's device gets online too. For separate always-on lines, each traveler should install their own HelloSIM eSIM.
Will the eSIM work on the Reunification Express train and long bus routes?
Generally yes along the populated coastal corridor between major cities, since 4G follows the main routes. Expect occasional dropouts in tunnels or remote stretches, so download anything essential beforehand.
