Destination
Internet on Thailand’s islands: ferries, boat trips and Wi-Fi
Mobile data on Thailand’s islands: where coverage is solid on Phuket and Samui, where it drops on ferries, boat trips and in bungalows, and how to avoid depending on Wi-Fi.
Plan for your trip: Thailand · 5 GB · 30 days — See plans →
Mobile data on Thailand’s islands usually works well in the towns, on the main beaches and around hotels on big, developed islands like Phuket and Koh Samui. It’s weaker on small islands, in national marine parks and during crossings, where the signal may disappear for the whole trip. The easiest way to connect is a Thailand travel eSIM installed at home, with tickets and bookings for the no-signal stretches saved offline in advance.
Where is mobile coverage weakest on the Thai islands?
Coverage on Thailand’s islands is weakest where there are few people and few cell towers: in open water, in remote coves and in marine parks. In towns, on the main beaches and in hotel areas, mobile data usually works fine.
- On boats and ferries in open water, especially between remote islands.
- On beaches behind hills and in coves you can only reach by water.
- In national marine parks and on small islands with few villages.
- In jungle bungalows, where even the hotel Wi-Fi doesn’t reach everywhere.
With a weak signal, your phone’s battery drains faster because it keeps searching for a network. Bring a power bank on island day trips, and save anything you might need offline ahead of time.
Is there signal on ferries and boat trips?
On ferries and boat trips you usually only have signal near the shore: a ferry or speedboat crosses open water, and the signal may disappear for the whole trip. If a transfer is meeting you at the pier, agree on the time in advance and save the driver’s or hotel’s phone number. A typical island route involves a flight, a transfer and a ferry, and connectivity behaves differently at every stage.
| Stage of the trip | What to expect | What to do in advance |
|---|---|---|
| Arrival airport | Usually signal; the eSIM comes on right after landing | Install the profile at home |
| Transfer to the pier | Coverage usually holds along the roads | Driver’s number and hotel address offline |
| Ferry or speedboat | The signal may drop for the whole crossing in open water | Ticket as a screenshot, transfer meeting time |
| Trip to outer islands, snorkeling | Signal mostly near the shore | Note the guide’s contacts and meeting point before you set off |
| Bungalow at the edge of the property or in the jungle | Hotel Wi-Fi doesn’t reach everywhere | Mobile data as a backup |
A simple plan for delays also helps: a meeting point and what to do next, with nothing that needs confirming by message. Sort this out with the hotel when you book the transfer.
On trips to far-flung islands and snorkeling tours, you’ll often only have signal near the shore. Keep your phone in a waterproof pouch on the water, and note down your guide’s contacts and the group meeting point before you set off.
Which is easier for the islands: eSIM or an airport SIM card?
For an island trip, an eSIM installed at home is easier: travelers report that tourist SIMs at Thai airports are registered with your passport, which means one more queue after the flight. A MoreSim eSIM for Thailand is bought from home, on the website or in the Telegram bot @moresim_bot, with the data, validity and price shown on the plan card on the Thailand catalog page.
You usually need data right after landing: to book a ride in an app, message your hotel and find the transfer desk. With an eSIM, you just set its line for data and turn on data roaming for it — most travel eSIMs run on a local carrier’s network as roaming — and you’re on your way without queuing at a kiosk.
The plan starts counting from your first connection in the destination country, so an eSIM installed a few days before your flight doesn’t lose any days. The eSIM goes on as a second line, so your home SIM and number stay in the phone. MoreSim plans are mobile data only, with no phone number: you call through messaging apps, and bank texts still reach your home SIM. Your remaining data is shown in the bot and in your account on the website.
How much data you need on the islands depends on your habits. Maps, messaging and looking up cafes and ferry schedules use little data, especially if you watch videos over hotel Wi-Fi. But if you post beach videos every day, plan a top-up in advance.
If your phone doesn’t support eSIM, a local SIM is still a solid option: bring your passport and allow time for registration at the airport. You can check your model in advance in the bot, which has a built-in compatibility check.
If you’re heading on to other countries in the region after the islands, install local plans for each country in advance and switch your mobile data line after each flight: as of October 2026, the MoreSim catalog has no regional plan that includes Thailand.
Is hotel and cafe Wi-Fi on the islands reliable?
Most hotels and cafes on the Thai islands have Wi-Fi, but speed varies a lot by location. In a bungalow at the edge of the property the router signal can be weak, and in the evening, when every guest is online, the network slows down. Mobile data is more reliable in those moments.
If you plan to work from an island, ask about Wi-Fi speed before booking: check with the hotel or read recent reviews. Keep mobile data as a backup in case the Wi-Fi in your room can’t handle a video call.
How to save mobile data on Thailand’s islands
Saving data on the islands starts before you go: offline maps, auto-downloads switched off and heavy videos left for evening Wi-Fi.
- Download offline maps of the islands and ferry routes before you fly.
- Turn off automatic app updates and cloud photo backup over mobile data.
- Upload snorkeling and tour videos in the evening over Wi-Fi.
- Turn on data saver mode in your phone’s settings.
- Check your remaining data in the bot or in your account on the website.
Also check your messaging apps’ settings: auto-downloading photos and videos from chats quietly eats data. You can limit it to Wi-Fi only. If you still run short, you don’t need a new eSIM: use “Top up data” on the eSIM card in your account or in the bot’s app, if top-ups are available for that plan.
What to do before you fly to the islands
Before you fly to the Thai islands, there are five things left to do, and they’re all easiest at home on Wi-Fi.
- Check phone compatibility in the bot, which has an automatic check by model.
- Buy the eSIM on the website or in the bot, paying with Telegram Stars from any country, right in the bot (bank card and SBP payments currently work with cards issued in Russia).
- Install the profile from the QR code at home while you have Wi-Fi.
- Download offline maps and screenshot your ferry tickets.
- After landing, pick the eSIM for mobile data, turn on data roaming for it and turn off mobile data on your home SIM. Menu names depend on your software version.
If something doesn’t work once you’re there, MoreSim support is reachable via /support in the bot, a ticket in your account and email.
FAQ
Is there mobile internet on the Thai islands?
On big, developed islands like Phuket or Koh Samui, coverage in towns, on the main beaches and around hotels is usually fine. The signal is weaker on small islands, in national marine parks, in coves you can only reach by water and during crossings. It’s best to prepare for those stretches in advance: download offline maps and save your tickets as screenshots.
Is there signal on the ferries between Thai islands?
On a ferry or speedboat in open water, the signal may disappear for the whole trip. Save ferry tickets and tour vouchers as screenshots, and agree on a time and meeting point with your pier transfer in advance. Write down the driver’s or hotel’s phone number before you set off.
Do I need a separate eSIM for each Thai island?
No: a Thailand plan works nationwide, Phuket, Samui and the small islands included. What changes is coverage, not the plan: on the big islands it’s usually solid in towns, while in marine parks and during crossings the signal can drop. There’s no need to switch lines between islands.
eSIM or an airport SIM card for the Thai islands: which is easier?
Travelers report that tourist SIMs at Thai airports are registered with your passport, which means one more queue before your transfer and ferry. An eSIM is bought from home and installed in advance, so after landing you just set its line for data and turn on data roaming. If your phone doesn’t support eSIM, a local SIM is still a solid option: bring your passport and allow time for registration.
Can I buy an eSIM for the Thai islands in advance?
Yes: you can buy a MoreSim eSIM for Thailand on the website or in the Telegram bot @moresim_bot, paying with Telegram Stars from any country, right in the bot (bank card and SBP payments currently work with cards issued in Russia), and the data, validity and price are listed on the plan card. The plan starts counting from your first connection in the destination country, so you can install the eSIM a few days before your flight.
Is hotel Wi-Fi on the Thai islands good enough?
Most hotels and cafes on the islands have Wi-Fi, but speed varies a lot by location: in a bungalow at the edge of the property the signal can be weak, and the network slows down in the evening. If you plan to work, ask about Wi-Fi speed before booking and keep mobile data as a backup. Banking apps are safer over mobile data than over open Wi-Fi.
How can I save mobile data when island hopping in Thailand?
Download offline maps of the islands and ferry routes before you fly, and turn off automatic app updates and cloud photo backup over mobile data. Set media auto-download in messaging apps to Wi-Fi only, and upload snorkeling videos in the evening over Wi-Fi. If you still run short, a MoreSim plan can be topped up without a new eSIM: use “Top up data” on the eSIM card in your account or in the bot’s app, if top-ups are available for that plan.