What about the ferry crossing to or from the mainland?

You'll have signal at the Donsak and Samui piers and near the coast, but expect it to drop mid-gulf on the Lomprayah or Seatran crossing. Cache your maps and booking confirmations before boarding, and you'll reconnect approaching the island.

Will it also work if I island-hop to Koh Phangan or Koh Tao?

Yes. It's a single national Thailand eSIM, so it keeps working on Koh Phangan's Full Moon beaches and on Koh Tao, as well as back on the mainland, all on one allowance with no extra SIM.

Koh Samui eSIM.

Name: Koh Samui travel eSIM
Brand: My Holiday SIM

One eSIM for Koh Samui — Chaweng's shore, Fisherman's Village and the Big Buddha.

from $3.14/day · unlimited dataAll of Thailand →

Unlimited data5G where availableInstant QR by emailKeep your number

1 · How many days?

10 daysOther:days

2 · How much data?

3GBBest pricevalid 15 days$6.80$0.68/day

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

Travellers (one eSIM each)

1 × 3GB (valid 15 days) · 10-day trip$6.80

Good to know in Koh Samui

Many travellers reach Samui by ferry from Donsak on the mainland rather than flying. Your eSIM works at the pier and on deck near shore, but download onward maps before the crossing, as mid-gulf signal drops out.

Two simple ways to buy

Koh Samui eSIM plans: unlimited, or by the GB.

Every Koh Samui eSIM from My Holiday SIM is one of two straightforward types. Pick whichever fits how you travel in Koh Samui — 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 Koh Samui?

A rough, honest guide to sizing your Koh Samui eSIM so you're not guessing. Most travellers in Koh Samui 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

Koh Samui eSIM: your local data guide.

Koh Samui pairs palm-lined beaches with winding ring-road drives between them, so navigation matters from the moment you arrive. A Koh Samui eSIM keeps Grab, maps and booking apps live as you settle into Chaweng, browse the Fisherman's Village night market in Bophut, or drive up to the golden Big Buddha. Set it up before you fly and connect on landing.

One eSIM for Koh Samui and all of Thailand. It's the national Thailand eSIM — from $3.14/day with unlimited data, working the same in Koh Samui as it does the moment you leave it.

Landing at Samui International Airport (USM)?

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

Koh Samui eSIM pricingbest-value plan · per day

Days

Per day

Total

Saving

3 days1GB

$0.67

$2.00

—

5 days1GB

$0.40

$2.00

−40%

7 days1GB

$0.29

$2.00

−57%

10 days3GBPopular

$0.68

$6.80

—

15 days3GB

$0.45

$6.80

−33%

30 days5GB

$0.26

$7.71

−61%

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

eSIM vs the old ways in Koh Samui

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

Koh Samui eSIM from $3.14/day — the whole bill, agreed before you fly.

On the ground

Where you'll lean on data in Koh Samui.

Chaweng Beach

The island's liveliest strip, where ride-hailing, restaurant maps and beach-club bookings all lean on mobile data.

Fisherman's Village (Bophut)

Translate menus, split bills by QR code and snap the Friday night market's lantern-lit lanes in Bophut.

Big Buddha (Wat Phra Yai)

Map the short causeway from Bophut and share views of the 12-metre golden statue near the airport.

Lamai Beach

Check maps to the Hin Ta and Hin Yai rocks and book a quieter southern-coast stay away from the crowds.

The practical bit

Getting around Koh Samui on your eSIM.

Apps you'll want online in Koh Samui

Grab— Ride-hailing across the island, handy where taxi fares between beaches run notoriously high.
12Go Asia— Books the Lomprayah and Seatran ferries to Koh Phangan, Koh Tao and the mainland.
Google Maps— Guides you around the ring road linking Chaweng, Bophut and Lamai beaches.
inDrive— Negotiate a fairer ride price on an island known for steep taxi charges.

How long to stay in Koh Samui

Samui stays usually last five to seven nights, blending beach time at Chaweng and Bophut with a Big Buddha visit and a hop over to Koh Phangan or Koh Tao.

How much data for Koh Samui

With maps, Grab, ferry apps and holiday photos, a balanced 3-5GB fits a week; choose Unlimited if you stream from your villa or need a reliable hotspot for remote work.

Coverage in Koh Samui

The beaches, ring road and main towns hold steady 4G on AIS and the others, but signal drops mid-gulf on the Donsak ferry crossing and thins on the quieter, jungly inland roads.

Where you're headed

Discover Koh Samui.

Koh Samui, Thailand — skyline and landmarks · stay connected with a Koh Samui eSIM from My Holiday SIM

Koh Samui, Thailand — streets and everyday scenes · stay connected with a Koh Samui eSIM from My Holiday SIM

Koh Samui, Thailand — sights worth exploring · stay connected with a Koh Samui eSIM from My Holiday SIM

Koh Samui, Thailand — a travel moment · stay connected with a Koh Samui eSIM from My Holiday SIM

How to activate your Koh Samui 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 Koh Samui

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

New to eSIM in Koh Samui?

What is a Koh Samui eSIM?

A Koh Samui eSIM is a digital SIM that's already built into your phone. Scan one QR code and a local Koh Samui 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 Koh Samui eSIM: data-only, zero bill shock.

Your Koh Samui eSIM handles the internet while you travel. Your home number stays exactly where it is — no surprise roaming charges in Koh Samui, 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 Koh Samui.

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 Thailand.

5G where available, fast 4G everywhere else

Connected · 5G

Your eSIM joins Thailand'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.

AIS
TrueMove H
dtac

Popular places covered

BangkokPhuketChiang MaiKrabiKoh SamuiPattaya

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 Koh Samui 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

Koh Samui eSIM questions, answered.

Yes. Activate it before you travel and enable it on landing at Samui International (USM); it connects to a Thai network like AIS across the island's beaches, ring road and main towns, so you're online for that first taxi.

Your Koh Samui 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 Thailand?