Will I have signal on the cruise and in the caves?

Partly. You will get data near the mainland and at bigger islands like Ti Top, but signal drops out among the remote karsts and vanishes inside caves such as Sung Sot. Cruise Wi-Fi is rare and slow, so download what you need first.

Is this the same eSIM I would use in Hanoi?

Yes. It is one national Vietnam plan, so the same eSIM you use in Hanoi keeps working in Ha Long City, on Cat Ba Island and across the bay's coastline. You only lose signal out on the open water and inside caves.

Ha Long Bay eSIM.

Name: Ha Long Bay travel eSIM
Brand: My Holiday SIM

Cruise Ha Long Bay's limestone karsts, Sung Sot Cave and Ti Top Island while staying online.

from $3.20/day · unlimited dataAll of Vietnam →

Unlimited dataFast 4G LTEInstant QR by emailKeep your number

1 · How many days?

10 daysOther:days

2 · How much data?

3GBBest pricevalid 15 days$9.04$0.90/day

Cheapest plan covering your trip: 3GB, valid 15 days.

Travellers (one eSIM each)

1 × 3GB (valid 15 days) · 10-day trip$9.04

Good to know in Ha Long Bay

Most Ha Long cruises include some hours with patchy or no signal out among the karsts, and caves have none at all; download offline maps before you sail; signal is strongest back on the mainland at Bai Chay.

Two simple ways to buy

Ha Long Bay eSIM plans: unlimited, or by the GB.

Every Ha Long Bay eSIM from My Holiday SIM is one of two straightforward types. Pick whichever fits how you travel in Ha Long Bay — you can always top up or switch on your next trip.

Traveller streaming and browsing freely on an unlimited-data travel eSIM

Unlimited plans

High-speed data, nothing to count

Priced per day — the longer you stay, the better the daily rate. Ideal for streaming, hotspot and longer trips where you'd rather not watch a data meter. A fair-use policy keeps speeds fast for everyone; see each plan for the detail.

Best for streaming, video calls & hotspot
Great for longer or open-ended trips
One price per day — no GB anxiety

By-the-GB plans

3GB10GB20GB

A set bundle, brilliant value

A fixed data allowance (say 3 GB or 10 GB) valid for your travel days. The best-value pick for lighter trips built around maps, messaging and a bit of browsing. Running low? Top up in a couple of taps — nothing to reinstall.

Best value for lighter, shorter trips
Clear allowance — pay only for what you need
Top up any time from your phone

Compare plans →Not every destination has both types — the picker shows what's available where you're headed.

Plan your data

How much data do you need in Ha Long Bay?

A rough, honest guide to sizing your Ha Long Bay eSIM so you're not guessing. Most travellers in Ha Long Bay are comfortable on 3–5 GB a week — heavy streamers just go Unlimited.

Traveller checking maps and messages on her phone using a My Holiday SIM eSIM

Not sure? Start with a 5 GB plan — you can top up in seconds if you run low.

Light

~1 GB / week

Maps, messaging & email

Google Maps, WhatsApp, email and the odd search. Plenty for a city break where you mostly need directions.

Suits 1–3 GB plans

Balanced

3–5 GB / week

Everyday holiday use

Everything above plus social scrolling, music, cloud photo backups and a little video. Where most travellers land.

Suits 5–10 GB plans

Ha Long Bay eSIM: your local data guide.

Ha Long Bay is a maze of emerald water and thousands of limestone karsts, explored by overnight cruise from Bai Chay or Tuan Chau, with stops at Sung Sot Cave, Ti Top Island and the kayaking lagoons. A Ha Long Bay eSIM keeps you connected on shore and along the coast, so you can share the view, check cruise details and message home between the islands.

One eSIM for Ha Long Bay and all of Vietnam. It's the national Vietnam eSIM — from $3.20/day with unlimited data, working the same in Ha Long Bay as it does the moment you leave it.

Landing at Van Don International Airport (VDO); most travellers arrive via Hanoi's Noi Bai (HAN)?

Install the QR at home, then switch the eSIM on as you taxi in — you're online before you reach the arrivals hall.

Ha Long Bay eSIM pricingbest-value plan · per day

Days

Per day

Total

Saving

3 days1GB

$1.28

$3.83

—

5 days1GB

$0.77

$3.83

−40%

7 days1GB

$0.55

$3.83

−57%

10 days3GBPopular

$0.90

$9.04

−30%

15 days3GB

$0.60

$9.04

−53%

30 days5GB

$0.41

$12.17

−68%

Each trip length shows the best-value plan that covers it. Total always shown before you pay.

eSIM vs the old ways in Ha Long Bay

eSIM

ROAMING

AIRPORT SIM

Data allowance

Unlimited

Usually capped

Rarely unlimited

Price known upfront

Prepaid

Billed after

Varies at the desk

Ready when you land

Instantly

After the queue

Keep WhatsApp number

SIM swapped

Ha Long Bay eSIM from $3.20/day — the whole bill, agreed before you fly.

On the ground

Where you'll lean on data in Ha Long Bay.

Bai Chay (Ha Long City)

Order a Grab, top up cruise bookings and grab last-minute supplies before boarding at the tourist harbour.

Sung Sot Cave (Surprise Cave)

Read up on the cave's chambers beforehand, as signal disappears once you step inside the karst.

Ti Top Island

Catch a bar or two of signal at the summit viewpoint to post that classic bay panorama.

Cat Ba Island

Lean on maps for Lan Ha Bay boat trips, the national park trails and the ferry connections back to the mainland.

The practical bit

Getting around Ha Long Bay on your eSIM.

Apps you'll want online in Ha Long Bay

Grab— Available in Ha Long City for cars and bikes; less useful once you are on the cruise.
Xanh SM— VinFast's electric taxis around Bai Chay and the harbours, booked in-app.
Vexere— Book buses and limousine vans from Hanoi to Ha Long, with live seat availability.
Google Maps— Download the region offline for the transfer and Cat Ba, where signal drops.

How long to stay in Ha Long Bay

Most visitors do a one or two-night cruise on Ha Long Bay, often as an overnight trip from Hanoi, taking in caves, kayaking and a sunrise over the karsts.

How much data for Ha Long Bay

Because much of a Ha Long cruise is offline anyway, 1-3 GB is plenty for the shore time and transfer; a larger plan only pays off if you also spend days exploring Hanoi or Cat Ba.

Coverage in Ha Long Bay

On land around Ha Long City and Bai Chay, Viettel, VinaPhone and MobiFone give solid 4G; realistically, signal drops out among the open water and remote karsts, and disappears entirely inside caves like Sung Sot.

Where you're headed

Discover Ha Long Bay.

Ha Long Bay, Vietnam — skyline and landmarks · stay connected with a Ha Long Bay eSIM from My Holiday SIM

Ha Long Bay, Vietnam — streets and everyday scenes · stay connected with a Ha Long Bay eSIM from My Holiday SIM

Ha Long Bay, Vietnam — sights worth exploring · stay connected with a Ha Long Bay eSIM from My Holiday SIM

Ha Long Bay, Vietnam — a travel moment · stay connected with a Ha Long Bay eSIM from My Holiday SIM

How to activate your Ha Long Bay eSIM.

Full installation guide →

A traveller happily planning her next trip with a map and phone

Buy your plan

Choose your days — the QR code arrives by email in seconds.

A traveller installing her eSIM from the sofa in two minutes

Install at home

Scan the QR on Wi-Fi before you fly. About two minutes, no app needed.

Friends laughing together while packing for a holiday

Fly relaxed

Nothing counts down yet — your days start only at first connection.

A joyful family reunion at the airport arrivals hall

Switch on in Ha Long Bay

Turn the line on when you land. Connected before baggage claim.

New to eSIM in Ha Long Bay?

What is a Ha Long Bay eSIM?

A Ha Long Bay eSIM is a digital SIM that's already built into your phone. Scan one QR code and a local Ha Long Bay data plan installs alongside your home SIM — no plastic, no tray tool, no swap. Your number and WhatsApp stay exactly where they are.

✓ 2-minute install✓ Keep your number✓ Works on phones from 2018+

How eSIM works →Check my phone

A traveller with a backpack smiling at her phone — online abroad with My Holiday SIM

Connected · 5G

Home SIM · calls & WhatsAppHoliday eSIM · unlimited data

30-day refund promiseUnused, uninstalled eSIM? Full refund, no questions.

The price is the billPrepaid and final — roaming charges can't happen.

Days start when you landInstall early with zero pressure; counting begins at first connection.

Humans, 24/7Real people answer, before, during and after the trip.

Peace of mind

Your Ha Long Bay eSIM: data-only, zero bill shock.

Your Ha Long Bay eSIM handles the internet while you travel. Your home number stays exactly where it is — no surprise roaming charges in Ha Long Bay, no swapping your real SIM out.

Keep your number & WhatsApp

The eSIM is data-only and runs alongside your home SIM. Your number, iMessage and WhatsApp keep working exactly as they do at home.

No roaming bills, ever

Turn data roaming OFF on your home SIM and ON for the eSIM. You pay once, up front — no overage, no metered surprises, no bill waiting when you land home.

One thing worth knowing

Because it's data-only, the eSIM can't receive bank verification (OTP) text codes — those still go to your home number. Keep it reachable on Wi-Fi calling, or use app-based codes.

Traveller relaxed and connected on her phone, no roaming bill to worry about

Why travellers choose My Holiday SIM for Ha Long Bay.

Instant eSIM deliveryQR code in your inbox seconds after checkout — even at the departure gate.

No physical SIMNothing to collect, lose or poke out with a paperclip. Your home SIM stays put.

Keep your WhatsApp numberData flows through us; WhatsApp stays on your home number. Family always reaches you.

A traveller at the departure gate, eSIM ready on her phone

eSIM ready in ~2 minutes

No bill shock, everOne clear price before you fly. Roaming charges simply can't happen.

Secure paymentsCards, Apple Pay, Google Pay, PayPal and Klarna — encrypted end to end.

Real human supportReal people — before, during and after your trip. Live chat and email, no bots. Easy top-ups too.

Coverage in Vietnam.

Fast 4G LTE nationwide

Connected · 4G

Your eSIM joins Vietnam's partner networks automatically — no settings to choose, no manual network hunting. If signal drops in a remote spot, toggling Airplane Mode for a few seconds forces a fresh connection.

Viettel
VinaPhone
MobiFone

Popular places covered

HanoiHo Chi Minh CityDa NangHoi AnHa Long BaySapaNha TrangPhu Quoc

Keep data roaming ON for the eSIM line only — that's the switch travel eSIMs use, and it never adds charges on our plans.

Trusted networks, honest numbers.

No invented star ratings behind your Ha Long Bay eSIM — just the numbers we actually stand behind.

Friendly globe with location pins — coverage on every continent

My Holiday SIMSTAY CONNECTED. ANYWHERE.

200+

destinations — every continent covered

regions covered by a single regional eSIM

~2 min

typical install — QR to connected

Live

chat & email support

Before you fly

Ha Long Bay eSIM questions, answered.

Most travellers fly into Hanoi's Noi Bai and transfer around two and a half hours by road, or use nearby Van Don airport. Your eSIM activates on landing, connecting to Viettel, VinaPhone or MobiFone, so the whole transfer is covered.

Your Ha Long Bay eSIM glossary.

eSIMA SIM built into your phone's hardware. Plans install onto it digitally — no plastic card involved.

QR profileThe code we email you. Scanning it downloads your holiday plan onto the eSIM. One scan per device.

Data roaming (the switch)The toggle travel eSIMs use to join partner networks abroad. On our plans it never adds charges — keep it ON for the eSIM, OFF for your home SIM.

Hotspot / tetheringSharing your phone's data with laptops and tablets. Included on our plans wherever networks allow.

Top-upExtra days added to a live plan from your account. They append to the end — nothing overlaps.

First connectionThe moment your eSIM first joins a network at the destination — that's when your days start counting, not before.

Travelling wider in Vietnam?