Best eSIM for Thailand in 2026: AIS vs TrueMove vs dtac Compared
Almost every guide to the best eSIM for Thailand still compares three mobile networks. There have only been two since 2023. TrueMove H and dtac merged into a single company that year and finished combining their towers in 2025, which means two of the three names on the shop sign now point at exactly the same signal. If you are choosing a plan on the basis of a three-way comparison, you are choosing between two things and a label.
That matters more than it sounds. Thailand is one of the easiest countries in Asia to buy a local SIM: walk out of arrivals, hand over your passport, and you are online in five minutes. So the case for an eSIM here is not about escaping a queue, the way it is in some countries. It is about landing already connected, because Thailand now requires a digital arrival card that you need to show at immigration, and about knowing which network you are actually on before you book a boat to a small island.
This guide compares AIS, TrueMove H and dtac as they exist in 2026, then covers where each network holds up and where it does not, what the Matrix plans cost and which one fits your trip, how much data a week really uses, the entry rules that changed in 2025 and may change again, when to visit each region, and seven quieter places worth the detour.
AIS vs TrueMove H vs dtac: what you are really choosing between
Thailand had three major mobile operators until 2023. In March that year, dtac and TrueMove H merged into True Corporation. The combined company became the largest mobile operator in the country by connections, leaving AIS as the only fully independent alternative. By 2025 the two networks had been physically integrated, and the dtac brand is now being wound down.
AIS
Advanced Info Service is the market leader by revenue and holds roughly 46 to 48 percent of mobile connections, depending on the quarter. Its practical advantage for travellers is reach. Independent network testing has given AIS the outright win for coverage experience in Thailand, with the True and dtac networks sharing a joint second place. In plain terms, AIS is the one with towers in places the others skipped.
TrueMove H
True Corporation holds roughly 50 to 52 percent of connections after the merger. In Bangkok, Chiang Mai, Phuket and the other cities, its performance is comparable to AIS and often faster on download speed. The gap only opens up once you leave the main routes.
dtac
Since the tower integration finished, dtac is a brand rather than a separate network. A dtac connection and a TrueMove H connection now travel over the same infrastructure. Anyone comparing dtac against TrueMove H in 2026 is comparing a name against itself.
The Matrix Thailand eSIM lists dtac as its network, which puts it inside the True Corporation footprint. That is a good fit for a Bangkok and main islands trip. If your itinerary is heavy on small islands and national parks, read the next section before you buy, because that is where the two networks genuinely differ.
Thailand coverage reality: where signal works and where it does not
Thailand has genuinely good mobile infrastructure. In Bangkok you will hold 5G on the BTS, the MRT and inside basement food courts. The same is true of Chiang Mai, Phuket town, Pattaya and Hua Hin. Long distance trains and buses keep signal for most of the journey.
The honest weak points are predictable once you know the pattern. Coverage follows population, so it thins on the small islands, in the park interiors and on the water. Koh Tao, Koh Lipe, Koh Kood and Koh Mak have service around the main beach and dead zones once you cross the island. Khao Sok has towers at the entrance and around the lake huts, and nothing on the jungle trails. The Similan and Surin islands have very little.
Ferry crossings are the one that catches people out. Between piers you should assume no data at all, which is exactly when you want your booking confirmation and your onward map. This is also where the network choice bites: on the smaller southern islands and in the national parks, AIS has the stronger record, and it tends to reacquire signal faster after a crossing.
One more that is specific to Thailand. During the Full Moon Party at Haad Rin on Koh Phangan, the signal is fine and the cell site is not. Tens of thousands of people on one beach will slow any network to a crawl. Upload your photos before or after, not during.
Download offline maps at your last hotel
Not at the pier and not on the boat. Save offline map areas for each island and each park while you still have a solid connection, and screenshot your return ferry time. This single habit removes most of the pain from Thailand's coverage gaps.
Matrix Thailand eSIM plans and prices
Matrix publishes four plans for Thailand, all prepaid and all data only. Prices below were taken from the product page on 13 August 2026 and are in Indian rupees. Prices change, so check before you buy.
| Plan | Validity | Price (INR) | Best for |
| Unlimited | 5 days | Rs. 899 | A long weekend in Bangkok or Phuket |
| Unlimited | 7 days | Rs. 949 | The standard one week trip |
| Unlimited | 10 days | Rs. 999 | Two centres, or a heavy hotspot user |
| 50 GB | 10 days | Rs. 949 | Ten days without a daily speed cap |
Look at the cost per day rather than the sticker price, because the four plans sit within a hundred rupees of each other. The 5 day plan works out to about Rs. 180 a day, the 7 day to Rs. 136, and both 10 day plans land near Rs. 100. The longer plans are much better value, and the ten day unlimited costs only Rs. 50 more than the ten day 50 GB plan.
The specification, in one place
| Feature | Matrix Thailand eSIM |
|---|---|
| Cellular network | dtac, inside the True Corporation network |
| Data speed | 5G / 4G, as listed on the product page |
| Countries covered | Thailand only |
| Plan type | Prepaid, data only |
| Calls and SMS | Over apps only. No local number is issued |
| Hotspot and tethering | Listed as allowed. See the note below |
| Validity starts | The day you install or activate it, per the product page |
| Activation | Automatic on installation |
| Delivery | QR code by email or through the app |
| Documentation | KYC required under Indian DOT rules |
Two things to confirm at checkout
The page states that validity starts the day you install, not the day you land, so install close to departure rather than weeks early. It also lists hotspot as allowed in the specification while the FAQ further down says hotspot is unavailable on some unlimited plans under fair usage rules. If tethering a laptop matters to you, confirm it for the specific plan before paying.
Which plan should you pick
For a five day city break, the 5 day unlimited plan is the simplest answer. For the standard week, take the 7 day. For anything approaching ten days, or if you are working from a laptop, the 10 day plans are the better value per day, and the small gap between them makes unlimited the easier choice unless you specifically want to avoid a daily speed cap.
What "unlimited" actually means in Thailand
Unlimited on a Thai network almost never means unmetered. The standard structure across this market is a daily allowance at full speed, after which your connection is throttled for the rest of the day and resets the next morning. Thai tourist plans commonly drop to a few hundred kilobits per second once the high speed portion is used, which is enough for messaging and just about enough for maps.
So the question to ask about any unlimited plan, from any provider, is not whether it is unlimited. It is how much full speed data you get each day and what the throttled speed becomes. A plan with a generous daily cap and a 1 Mbps floor behaves very differently from one that drops to 384 kbps.
This is also why the 50 GB plan exists alongside the unlimited ones. Fifty gigabytes over ten days is five a day, and it is a fixed allowance rather than a daily reset, so heavy days do not get punished. For most travellers it is more data than a trip needs.
How much data do you actually need
Most people overestimate. Maps, messaging and ride hailing are light. Video is heavy. This assumes hotel Wi-Fi overnight, which in Thailand is generally good and free.
| Traveller type | Daily use | Week total | Plan that fits |
| Maps, chat, Grab, a few photos | 200 to 400 MB | 2 to 3 GB | Any plan |
| Normal tourist: social and browsing | 500 MB to 1 GB | 4 to 7 GB | 7 day unlimited |
| Heavy social: reels and uploads | 1.5 to 2.5 GB | 10 to 17 GB | 7 or 10 day unlimited |
| Remote worker with a tethered laptop | 2 to 4 GB | 15 to 28 GB | 50 GB, 10 days |
| Family sharing one hotspot | 2 to 5 GB | 15 to 35 GB | 50 GB, 10 days |
Three habits cut usage sharply: download offline maps before you travel, set video apps to standard definition on mobile data, and turn off automatic photo backup until you are on Wi-Fi.
Entry rules: the arrival card, the app and the 60 day question
Thailand replaced its paper arrival form with the Thailand Digital Arrival Card on 1 May 2025. Every foreign national must complete it before arriving, including travellers entering visa free, and it is free. Submit it within 72 hours of arrival at tdac.immigration.go.th. Airlines have been instructed to check for it, so an incomplete card can mean being turned away at the departure gate rather than at Thai immigration.
The Immigration Bureau has also been piloting a mobile app called THIM, which produces the same arrival card from your phone, and it was scheduled to become the main channel from August 2026. Because that transition is happening right now, check which route is live shortly before you fly rather than assuming.
Screenshot the QR code before you board
Your arrival card QR has to be shown at passport control, and the arrival hall is exactly where mobile data is slowest. Save it to your photos so it works with no connection at all. This is the single strongest argument for setting up an eSIM before departure rather than buying a SIM after landing.
On visas, Indian passport holders currently enter visa free for up to 60 days, extendable by a further 30 days at an immigration office. There is an important caveat: the Thai Cabinet approved ending the 60 day scheme in May 2026 and reverting most nationalities to 30 days, and that change had not taken effect at the time of writing. Check the position before booking a long trip. Immigration may also ask for an onward ticket, accommodation and proof of funds, and Indian travellers report being asked more often than most.
Best time to visit Thailand, region by region
The single most useful fact about Thai weather is that the two coasts get their bad weather at different times. The Andaman side, which is Phuket, Krabi and Koh Lanta, is wettest from roughly May to October. The Gulf side, which is Koh Samui, Koh Phangan and Koh Tao, takes its monsoon later, around October to December. There is almost always one coast worth visiting.
November to February is the cool, dry window and the peak season nearly everywhere. March to May is the hot season, with Bangkok regularly passing 35 degrees. June to October is the rainy season, which is far less disruptive than it sounds: usually a heavy afternoon downpour rather than all day drizzle, with lower prices and thinner crowds.
The one warning worth taking seriously is the northern burning season. From roughly February to April, agricultural fires across the north push air quality in Chiang Mai and Chiang Rai to genuinely unhealthy levels, and the mountain basin traps the smoke. March is the worst of it. If you have respiratory issues or you came for the mountain views, plan the north for November to February instead.
| Period | What it is like | Where to go |
| November to February | Cool, dry, the busiest and priciest stretch | North, Bangkok, Andaman coast |
| February to April | Hot, and smoke haze in the north | Andaman beaches, Gulf islands |
| April | Peak heat, plus Songkran mid month | Anywhere you do not mind getting soaked |
| May to September | Rainy on the Andaman side, cheaper | Gulf islands, which stay drier |
| October to December | Gulf monsoon, rough island transfers | Andaman coast, which is drying out |
Where to go in Thailand
Bangkok
Bangkok rewards a slower approach than most itineraries give it. The Grand Palace and Wat Pho are the obvious anchors, but the city is better experienced through its river ferries, its markets and the food. Signal is excellent everywhere, including underground.
Chiang Mai and the north
Old city temples, a cooler climate and the base for everything from cooking classes to ethical elephant sanctuaries. Pai, a few hours north through a famously winding road, is worth the trip in the cool months. Check air quality before booking anything between February and April.
The Andaman coast
Phuket, Krabi, Koh Lanta and Phi Phi. Limestone karsts, clear water and the best diving visibility from November to April. This is where the crowds concentrate, so the smaller islands nearby are usually the better call.
The Gulf islands
Koh Samui for comfort, Koh Phangan for the Full Moon Party and a quieter north coast, Koh Tao for some of the cheapest diving certification anywhere. Their season runs later than the Andaman side, which makes them the summer answer.
Isaan, the northeast
The least visited third of the country and the most rewarding for anyone tired of the circuit. Khmer temple ruins, distinct food that leans hot and sour, and prices that feel like Thailand a decade ago. Bring patience for the bus timetables.
Seven quieter corners of Thailand
| Place | Best months | Why go |
| Koh Kood, Trat | November to April | One of the largest Thai islands with almost no nightlife. Waterfalls, empty beaches, a long transfer that keeps numbers down. |
| Nan | November to February | A quiet northern province near the Lao border with Lanna temple murals and mountain roads that see very few tourists. |
| Khao Sok National Park | December to April | Limestone cliffs over rainforest, and floating huts on Cheow Lan Lake. Expect no signal past the lake, which is rather the point. |
| Phu Chi Fa, Chiang Rai | December to January | A cliff above the Mekong valley where the cloud sea forms at dawn. Genuinely cold before sunrise, so bring layers. |
| Sangkhlaburi | November to February | A Mon community on a reservoir, a long wooden footbridge and a temple that surfaces when the water drops. |
| Koh Yao Noi | November to April | Rice fields and rubber plantations in the middle of Phang Nga Bay, an hour from Phuket and nothing like it. |
| Phanom Rung, Buriram | November to February | A Khmer sanctuary on an extinct volcano rim in Isaan, older than Angkor Wat and usually near empty. |
Note the coverage pattern for all of these. You will generally have signal in the village or at the park entrance and very little beyond it. Koh Kood and Koh Yao Noi both involve boat transfers with no data at all.
How to install your Thailand eSIM
Do the setup at home on Wi-Fi. An eSIM profile can usually only be installed once, and the product page states validity begins at installation, so time it close to departure.
- Dial *#06#. An EID means your handset supports eSIM. You can also use the handset compatibility checker. The phone must not be carrier locked.
- Buy the plan and complete the KYC step. The QR code arrives by email. The delivery and activation page explains what to expect.
- Scan the QR in your phone's mobile data settings and label the line Thailand.
- On landing, set the Thailand line as your data line and turn data roaming on for it. Leave your home SIM for calls and texts with its own data switched off.
- Test maps and a messaging app before you leave the terminal. If you see no service after ten minutes, restart, then try selecting the network manually. The troubleshooting guide covers the rest.
Practical quick reference
| Item | What to know |
| Currency | Thai baht. Cards work in cities and resorts, cash is essential at markets, on islands and for songthaews. |
| Language | Thai. English is widely understood in tourist areas and much less so in Isaan and the far north. |
| Power | 220 volts. Sockets take flat two pin and round two pin plugs, so most Indian chargers fit without an adapter. |
| Tap water | Not for drinking. Bottled and filtered water is cheap and everywhere. |
| Transport | Cheap domestic flights, overnight trains, and Grab in the cities. Ferries between islands run to the weather. |
| Tipping | Not expected. Rounding up is normal, and smarter restaurants add a service charge. |
| Safety | Generally very safe. The main risks are road accidents on rented scooters and the sea during monsoon swells. |
| Emergencies | 191 for police, 1669 for ambulance, 1155 for the tourist police. |
Frequently asked questions
Which network does the Matrix Thailand eSIM use?
dtac, which since the 2023 merger runs on the True Corporation network. It is a strong choice for cities and the main tourist islands.
Are AIS, TrueMove H and dtac really three different networks?
No, not since 2023. TrueMove H and dtac belong to True Corporation and share the same infrastructure. The genuine choice in 2026 is AIS or True.
Is it 5G?
The product page lists 5G / 4G. In practice, 5G is concentrated in Bangkok, Chiang Mai, Phuket and Pattaya, and you should expect 4G in rural areas and on smaller islands regardless of provider.
Can I make calls or send SMS?
Not over the mobile network. These are data only plans with no Thai number, so calls happen over WhatsApp, FaceTime or similar apps.
Do I keep my Indian number?
Yes. The eSIM sits alongside your existing SIM, so you keep your number for calls, texts and one time passwords while data runs on the Thailand line.
When does my validity start?
The page states it starts the day you install or activate the eSIM on your phone, not the day you land. Install close to your departure date.
Is an eSIM better than a local Thai SIM?
For most trips, yes, though the margin is narrower here than in many countries. Thai airport SIM counters are quick and cheap. The eSIM wins because you land already connected, which matters when you need to show your arrival card QR at immigration, and because you keep your home number.
Do I need a visa for Thailand?
Indian passport holders currently enter visa free for up to 60 days, though a reduction to 30 days has been approved and may take effect. Everyone must complete the digital arrival card before travelling.
What happens if I skip the arrival card?
Airlines check for it at boarding, so you risk being denied boarding entirely. It is free and takes a few minutes, and it must be submitted within 72 hours of arrival.
Will my Thailand eSIM work in Cambodia, Laos or Malaysia?
No. This plan covers Thailand only. For a multi country trip, the Southeast Asia regional eSIM covers Indonesia, Malaysia, Singapore, Thailand and Vietnam.
Which phones support eSIM?
Most iPhones from the XS onward, recent Samsung Galaxy S and Fold models, and Google Pixel from the 3 onward. Dial *#06# to check for an EID.
Can I top up mid trip?
Yes. You can buy another pack online and it is added to the same eSIM, with no store visit and no SIM swap. See the recharge options.
The short version: choosing the best eSIM for Thailand
Thailand has two mobile networks wearing three brand names, and the merger of TrueMove H and dtac in 2023 is the reason most comparisons you will read are out of date. AIS is the coverage leader, particularly on small islands and in national parks. The True network, which the Matrix eSIM reaches through dtac, is strong across the cities and the main tourist circuit where the overwhelming majority of trips actually happen.
Pick the 5 or 7 day unlimited plan for a short trip, and either 10 day plan if you are staying longer or tethering a laptop, since both work out near Rs. 100 a day. Install before you fly so your arrival card QR is on your phone when you land, download offline maps before every boat, and remember that whichever network you are on, the ferry is going to be a dead zone.
Browse the full range of travel eSIMs if Thailand is one stop on a longer trip.
Last updated: 13 August 2026. Prices and plan details were checked against the Matrix Thailand eSIM product page on that date and can change. Entry rules and the 60 day visa exemption are under active review, so verify both close to your travel date.
