Tip · If you want the easiest arrival, buy an AIS or True tourist SIM or eSIM before you leave the airport. If you want the best value, compare plans at an official shop in town.
The airport SIM counter is the worst of both worlds: more expensive than a 7-Eleven SIM and with less choice than a city network store. It survives on one thing, which is that you want data the moment you land and don't yet know there's a better way.
My own approach is the cheapest one: buy a SIM card at 7-Eleven, then buy a data package through the provider's app. Two things to get right before you travel: bring your passport (registration is done in person, with a photo of you) and make sure your phone is unlocked.
Mobile data matters from the first minute in Thailand. It runs your ride apps, hotel messages, maps, translation, and restaurant searches. So here are all the options, from cheapest to most convenient.
The main networks
Thailand has three names you will see again and again, but only two networks. True and dtac merged in 2023 and now run on one network, and the dtac app has been folded into the True app. Dtac-branded SIMs are still on the shelves, but they are True underneath.
| Network | Coverage strength | Tourist plan availability | Best for |
|---|---|---|---|
| AIS | Strongest nationwide, including remote islands | Widely available at airports and 7-Elevens | A safe default for most trips |
| True (also sold as dtac) | Strong in cities, very reliable in Bangkok | Many airport and mall counters | City-heavy itineraries |
For a normal first trip, either can work well. If you are heading to smaller islands or mountain areas, ask your hotel or guesthouse which network works best there. AIS is the most common answer.
The cheapest option: 7-Eleven + app top-up
If you want the best value and don't mind a small amount of setup, this is the approach:
- Pick up a SIM card from any 7-Eleven (they are everywhere). Branches near airports mostly stock the 299 baht tourist starter packs, which the airport counters sell for 399 baht and up. Branches in town often have a bare prepaid SIM for under 200 baht.
- The staff register it at the counter with your passport and take a photo of your face. This has been mandatory since August 2025, so there is no registering later in the app.
- Open the provider's app (myAIS, or the True app for True and dtac) and buy a data package in there. The app packages are cheaper than the airport tourist packs, and you choose the number of days and amount of data yourself.
This gets you local pricing rather than the airport markup. The trade-off is that you're doing the package part yourself, with no staff to help if something goes wrong. If you land late at night or just want it done, the airport counter is fine.
The rules that changed in 2025 and 2026
Thailand tightened SIM registration to fight scam call centres, and it affects tourists directly:
- Registration happens in person at an operator shop or an authorised dealer, which includes 7-Eleven and the airport counters. Remote sign-up is no longer allowed, and the staff take a live photo of you alongside your passport.
- A tourist SIM registered on a foreign passport is valid for at most 60 days and cannot be extended by topping up. If you stay longer, you re-register at an operator shop.
- Foreigners can hold at most three SIMs per operator.
None of this is a problem for a normal holiday. It just means the passport is not optional and the "register it later" shortcut is gone.
Airport SIM or city shop?
The airport's only real advantage is immediacy: you need data right after landing and don't want to figure out 7-Eleven on your first day. The staff will also test that your phone works before you leave the counter, which has some value if you're not confident troubleshooting.
If you can wait until you're settled, buying in the city saves money and gives you more plan options. The six AOT airports (both Bangkok airports, Phuket, Chiang Mai, Chiang Rai, and Hat Yai) have free Wi-Fi for three hours: connect to the AOT network, install the SAWASDEE by AOT app when prompted, and register with your passport number. That is enough to message your hotel and book a Grab. Shopping malls in Bangkok, Chiang Mai, Phuket, and other cities have network stores where staff speak English and can help you choose.
What to bring
Bring your passport. Thai mobile registration requires it, and the staff will scan or photograph your passport page and take a photo of you.
Also make sure your phone is unlocked before you travel. If your phone is locked to a carrier at home, a Thai SIM may not work.
What about eSIMs?
An eSIM lets you install a Thai data plan before you leave home and activate it the moment your plane lands. You skip the queue entirely. Third-party eSIMs like Airalo and Saily run as roaming plans, so the Thai passport registration and the 60-day cap don't apply to them.
Popular eSIM providers for Thailand:
| Provider | Typical price (7-day) | Pros | Trade-offs |
|---|---|---|---|
| Airalo | $5–$10 | Largest plan selection, polished app, instant activation | Network choice is hidden; support is app-only |
| Saily | $4–$9 | Clean app, made by the team behind NordVPN, handy if you're hopping between countries on one plan | Third-party support, app-only; the underlying network isn't shown |
| KKday | $4–$9 | Often cheapest, runs on AIS or True | Smaller plan range, less mature app |
| AIS / True direct | $8–$15 | Real local support, top-up in any 7-Eleven | Setup is in Thai-leaning apps, and the Thai registration rules apply |
The main thing to check is that your phone supports eSIM. Most flagship phones from the last three or four years do, but it is worth confirming before you buy.
The tradeoff is that airport staff may not be able to help as much if something goes wrong with a third-party eSIM. If you are not comfortable troubleshooting your phone, a physical SIM at an airport counter can be less stressful.
If you go the eSIM route, the one I'd steer most people toward is Saily. It's made by the team behind NordVPN, the app is genuinely clean, and you can have a Thailand plan sitting ready to switch on the second you land. For a longer stay I still think a 7-Eleven SIM is better value, but for a short trip, or if you just want it sorted before you fly, an eSIM like this is the least hassle.
The Saily link is an affiliate link: if you buy through it I earn a small commission, at no extra cost to you.
Quick recommendation
If this is your first time in Thailand, do not overthink it. Get a tourist SIM or eSIM from a known provider, confirm that data works before leaving the counter, and enjoy the trip.
The SIM is the easy part. If the rest of the trip is still a blank, how I'd plan a trip to Thailand walks through the decisions that matter more: the month, the number of places, and what to book yourself.