eSIM for Thailand: a traveller's guide

An eSIM for Thailand is the easiest way for most visitors to get online. Buy a Thailand plan, install it at home on Wi-Fi, and switch it on when you land. Your phone joins a Thai network as a visitor. You get local data for Grab, maps and messages straight away, with no SIM counter queue, no passport registration and no daily roaming charge.

You've probably booked flights and want your phone sorted before you go. It's worth doing at home.

Since May 2026, foreigners buying a SIM card in Thailand must register in person, primarily with a passport, and can hold at most three SIMs per operator. Below: which networks you'll use, how an eSIM compares with an airport SIM, and how much data you need. Then setup steps, the arrival card, signal on the islands, and the mistakes that most often cost travellers their plan.

Does an eSIM work in Thailand?

Yes. A travel eSIM connects to Thai networks in the same way a local SIM card would. Coverage is good in Bangkok, Chiang Mai, Phuket and the popular islands. Two things decide whether it will work for you: your phone must support eSIM, and it must be unlocked.

An eSIM is a SIM chip built into your phone. Instead of inserting a plastic card, you download the plan onto it. New to the idea? Our plain-English eSIM guide explains how it works.

Check your phone in 30 seconds

1. Does it support eSIM? Type *#06# in your phone's dialler. If a number labelled EID appears, your phone has an eSIM chip. As a rough guide, iPhone XS or newer, Pixel 3 or newer and Galaxy S20 or newer support it. Our phone check covers hundreds of models.
2. Is it unlocked? On iPhone, go to Settings → General → About → Carrier Lock. "No SIM restrictions" means it's unlocked. On Android, ask your carrier. A locked phone may install the eSIM and then refuse to connect. More on compatibility.

If you bought the phone outright, it's usually unlocked. If it came on a contract, check with your carrier before buying any travel eSIM.

Which network will a Thailand eSIM use?

That depends on the plan. Thailand's mobile market is led by AIS and True Corporation. True merged with DTAC in 2023 and kept the True Corporation name. On your phone you may see network names such as TrueMove H, dtac or AIS.

Most of our Thailand data plans connect to TrueMove H and dtac. Our Day Pass lists dtac, AIS and TrueMove H. Each plan on our Thailand page lists its networks with 4G or 5G next to them, so you see what you're getting before you pay.

When a plan lists more than one network, your phone can use whichever is strongest. That helps on the islands, where the best network can change from one beach to the next.

You get 5G only when the plan lists it, your phone supports it, and there's 5G where you're standing. Otherwise you're on 4G, which is plenty for maps, Grab and video calls.

Is an eSIM better than an airport SIM card in Thailand?

For most visitors with an eSIM-capable phone, yes. You skip the queue and the in-person registration, and your home SIM stays in your phone for bank codes. An airport SIM still suits phones without eSIM, and anyone who needs a Thai phone number.

The 2026 SIM rules for foreigners

Thailand tightened SIM registration in 2026. The law firm Tilleke & Gibbins summarised the new rules on 19 May 2026. The main points:

• Three SIMs per operator. Since 16 May 2026, people without Thai nationality can hold at most three SIM cards per person with each operator.
• Passport first. Identity checks are done primarily with a passport.
• In person. Registration happens at an operator's branch or an authorised dealer.
• Activate within 60 days. A registered SIM must be activated within 60 days, or you re-verify in person.

None of this applies to a kimsim eSIM. You buy it online and install it at home, so there's no counter to visit.

If you do buy a SIM card in Thailand

Sometimes a physical SIM is the right call, for example for an older phone or a long stay that needs a Thai number. Under the 2026 rules, a few things make it smoother:

1. Bring your passport to the counter. It's the primary document for registration.
2. Make sure your phone is unlocked before you travel, or the new SIM won't work.
3. Activate it soon. A registered SIM that isn't activated within 60 days needs a fresh in-person check.
4. Keep your home SIM safe. Tape it inside your passport cover or a card wallet. You'll need it for bank texts when you get home.
5. Remember the limit of three SIMs per operator if you're buying for several devices.

The kimsim Thailand connection picker

This is our own rule of thumb, built from the comparison above. Work down the list and stop at the first line that fits.

1. Your phone doesn't support eSIM, or it's locked? Buy a tourist SIM at the airport, and bring your passport.
2. You need a Thai number, for example to receive calls from a landlord on a long stay? A Thai SIM, registered with your passport.
3. A day or two in Thailand, and your home plan includes it? Roaming may be simplest. Check the daily charge first.
4. Everyone else: a travel eSIM per person. Nothing to queue for, nothing to return, and your home SIM stays in.

How much data do you need in Thailand?

Many travellers use around 3 to 7 GB a week for maps, messages and some social media. Thailand trips often run higher, because you book rides several times a day, navigate every scooter trip and upload beach video. Streaming and using your phone as a hotspot use much more.

These are rough figures, and they vary a lot by app and settings. For a fuller breakdown by activity, see how much data you need for a week abroad.

Data pack or Unlimited?

• A data pack gives you a set amount, such as 5 GB, for a set number of days. If you run low, you can top up onto the same eSIM.
• Unlimited gives you a daily allowance at full speed, then 1 Mbps for the rest of the day. That's fine for maps, Grab, messages and music, but not HD video.
• Day Pass works the same way, with a lower speed after the daily allowance: 384 Kbps on our Thailand Day Pass. Good for chat and maps, slow for anything else.

Every plan shows its after-cap speed before you pay. What Unlimited and Day Pass mean, and what "unlimited" really means on a travel eSIM.

A worked example

Suppose you're spending 14 days in Thailand: four in Bangkok, four in Chiang Mai and six on Koh Samui and Koh Phangan. You book Grab most days, use maps on every scooter ride, post stories each evening and make a few video calls home.

Using the "typical" row, that's roughly 4–7 GB a week, or about 8–14 GB for two weeks. That's our arithmetic from the table, not a measured figure. A 10 GB pack with the option to top up covers the lighter end. If you upload a lot of video from the islands, an Unlimited plan removes the guesswork.

For comparison, at Verizon's $12 a day, 14 days of roaming would cost $168, our calculation from Verizon's published rate.

Will you have signal on the islands and in the north?

In towns, at piers and on the main beaches, generally yes. Expect gaps on ferries and longtail boats between islands, on snorkelling trips, in national parks and on remote mountain roads in the north.

• Bangkok and the big cities: fast 4G nearly everywhere, with 5G in many busy central areas.
• The islands: good in towns and along the main beaches of Phuket, Koh Samui, Koh Phangan, Koh Tao and Koh Lanta. Quieter bays and hillside villas can be weaker.
• At sea and in the wild: patchy. Download offline maps and save boat tickets before day trips.
• Near borders: your phone may briefly pick up a neighbouring country's network. A Thailand-only plan won't use it, so expect a short drop.

How to set up a Thailand eSIM, step by step

The whole thing takes about five minutes at home and a minute when you land. Do the first part on Wi-Fi, days or weeks before you travel.

Before you fly

1. Check your phone supports eSIM and is unlocked (see above).
2. Buy a plan for Thailand that covers your trip, with some data to spare.
3. Install it on Wi-Fi. On iPhone you can usually install with one tap. On Android, scan the QR code from another screen. Guides: iPhone, Samsung, Pixel, other Android.
4. Rename the line to something like "Thailand". How to rename it.
5. Complete your TDAC (see below) and screenshot the confirmation.
6. Leave the kimsim line switched off until you land in Thailand.

With kimsim, you can install the eSIM any time within 180 days of buying it. The plan's days start when the eSIM first connects to a network in Thailand, not when you buy or install it. More on when your plan starts.

The Thailand Digital Arrival Card

Every non-Thai national entering Thailand by air, land or sea must complete the Thailand Digital Arrival Card (TDAC) before arriving. It has been required since 1 May 2025, and the official portal is tdac.immigration.go.th. It's submitted in the three days before you arrive. Use the official portal only, do it on Wi-Fi before you fly, and keep a screenshot in case you're offline at immigration.

When you land

1. Switch on the kimsim line in your SIM settings.
2. Make it your mobile data line. On iPhone: Settings → Mobile Service → Mobile Data → choose kimsim.
3. Turn on Data Roaming for the kimsim line. Your phone treats a travel eSIM as roaming, so it won't connect without this. You won't be charged roaming: the plan is prepaid. Why this matters.
4. Turn Data Roaming off on your home line, so your home carrier doesn't bill you for data.
5. Wait a minute or two for signal bars and a Thai network name. If nothing appears, toggle Airplane Mode once, then restart.

Still nothing? Follow our no signal on arrival steps.

Can you use Grab, LINE and WhatsApp without a Thai number?

Yes. Our Thailand plans are data only, with no Thai number and no normal calls or SMS, but the apps you'll use most run over data. Grab, Bolt, WhatsApp, LINE, iMessage, FaceTime, Telegram and Signal all work on your usual accounts.

• Grab in Thailand covers rides, food delivery (GrabFood), groceries (GrabMart), parcels (GrabExpress) and payments (GrabPay). Set it up at home and add a card before you fly. Sign-up may send a code by text to your usual number, which arrives on your home SIM.
• LINE is widely used in Thailand by hotels, tour operators and dive shops, alongside WhatsApp. Install it before you leave.
• Your home SIM can stay on for calls and texts, such as bank codes. Those are charged at your home carrier's rates. More on calls and texts, and how WhatsApp works with a travel eSIM.

If you need a Thai number, for example for a long stay, you'll need a physical Thai SIM, registered in person with your passport.

How much does roaming cost in Thailand?

It depends on your carrier, but Thailand is rarely included. Verizon's TravelPass costs $12 a day outside Mexico and Canada, with 5 GB of high-speed data a day, then 3G speeds.

UK, EU and Australian carriers usually price Thailand outside their included zones too. Check your own carrier's Thailand rate before you go. Our comparison of eSIMs and roaming explains the trade-offs.

Apps and services that need data in Thailand

Set these up at home, on Wi-Fi, so they're ready the moment you land.

• Grab and Bolt for taxis, motorbike taxis and food delivery.
• Google Maps, with offline maps downloaded for the islands and the north.
• A translation app with camera mode for menus and signs, with Thai downloaded for offline use.
• LINE, for chatting with hotels and tour operators.
• Ferry, airline and hotel apps, with tickets saved offline for boat days.

Save Thailand's Tourist Police hotline: 1155. A data-only eSIM can't make normal calls, so call it from your home line or another phone.

Travelling as a family or group?

Each phone that needs its own data needs its own eSIM. That's usually simpler than it sounds, and it means nobody is stuck without maps when you split up at a night market.

• Phones that support eSIM: buy one plan per phone, and install each on its own phone at home. Each eSIM installs once, on one device, and can't be moved, so do it with the right phone in hand. Installed on the wrong phone?
• Children's phones and tablets: if a child only needs data now and then, sharing from a parent's phone with hotspot can work. Test it on day one, and remember everything they use comes out of the parent's plan.
• A phone without eSIM in the group: that person needs a tourist SIM or a hotspot from someone else's phone.
• Different trip lengths: each eSIM starts when it first connects in Thailand, so someone arriving a few days later loses nothing by installing early.

Pick plan sizes per person, not per family. A teenager posting video all day and a parent checking maps use very different amounts.

Travelling on to Vietnam, Cambodia, Laos or Malaysia?

Thailand is often one stop on a longer Southeast Asia trip. You can use one eSIM per country, or a regional plan that covers several countries on one eSIM.

• One eSIM per country. Install them all at home. Each starts when it first connects in its own country, and it's usually the best value when you spend a week or more in each.
• A regional plan, such as our Southeast Asia plan. Check that every country on your route is on its list, including any you only pass through. How regional plans work.

Heading south by train or bus? Our Malaysia eSIM sits happily alongside your Thailand one: your phone stores several, and you switch the right line on in each country.

Common mistakes with eSIMs in Thailand

Most eSIM problems in Thailand come from a handful of avoidable mistakes. Here they are, with the fix for each.

1. Leaving the line on during a stop-over. Many flights to Thailand connect in Singapore, Hong Kong, Kuala Lumpur, Doha or Dubai. Keep the kimsim line off until you land in Thailand, so the plan doesn't start early. Plan started early?
2. Forgetting Data Roaming. It's the most common reason for "no internet". Turn it on for the kimsim line, and only that line.
3. Leaving the TDAC to the last minute. Do it on Wi-Fi before you fly, on the official portal only.
4. Deleting the eSIM to "fix" it. A deleted eSIM usually can't be reinstalled. Restart the phone instead, then work through signal but no data.
5. Setting up Grab after you land. A sign-up text goes to your usual number. Do it at home.
6. Letting backups run. Photo backups and app updates over mobile data can use gigabytes in a day. Save data.
7. Relying on hotspot without testing. Try it on day one before you plan remote work around it. Hotspot tips.

Slow on an island? Check whether you've used your daily full-speed allowance, then try another network by hand. Slow data tips.

How we put this guide together

We wrote this guide in November 2026 and checked third-party facts that month. Sources include a May 2026 summary of Thailand's new SIM registration rules by the law firm Tilleke & Gibbins, and reporting on the Thailand Digital Arrival Card. We also checked the Tourist Police and Grab Thailand websites. We also used Verizon's published roaming rates.

Facts about kimsim plans come from our own help centre and plan data. We didn't run our own coverage tests for this article, so coverage notes are general guidance. kimsim sells travel eSIMs, including for Thailand. We've described airport SIMs, roaming and pocket Wi-Fi on the same criteria, because they're the better choice for some trips.