Getting connected in Bangkok is cheap, fast and refreshingly painless — Thailand has some of the best-value mobile data in the world, and you can walk out of the airport with unlimited 5G for the price of a couple of coffees. The only real decision is which carrier and plan suits your trip, and whether to grab a physical SIM or go with an eSIM before you even land. This guide breaks down the current options for 2026 — AIS, dtac and TrueMove H — with real prices in baht, where to buy, and what works best for tourists versus longer-staying digital nomads.
One quick note on the landscape: as of 2023, dtac and True merged into a single operator, True-DTAC, so dtac and TrueMove H now run on the same combined network. Alongside AIS, that gives Thailand two dominant networks, both with excellent coverage in Bangkok and across the country. You genuinely can’t go far wrong.
Speeds are genuinely fast, too. 5G is widespread across Bangkok and most provincial cities, and even 4G comfortably handles video calls, streaming and hotspotting a laptop. Compared with mobile data prices in Europe, North America or Australia, what you pay in Thailand will feel almost free — part of why the country is such a magnet for remote workers in the first place.
Quick Comparison Table
| Option | Price from | Data | Validity | Best for |
|---|---|---|---|---|
| AIS Tourist SIM | ~299 THB ($8) | 15GB to unlimited | 8–30 days | Widest coverage, islands & the north |
| dtac (True-DTAC) Tourist SIM | ~349 THB ($10) | 15–30GB or unlimited | 8–30 days | Great value for city & everyday use |
| TrueMove H “Tourist Infinite” | ~449 THB ($12.50) | Unlimited 5G | 8–30 days | Heavy data users & streamers |
| eSIM (Airalo, Holafly, etc.) | ~$4 | 1GB to unlimited | 3–30 days | Convenience, skipping the queue |
Prices are approximate 2026 figures and shift with promotions, but they give you the right ballpark. Below, each carrier in detail.
AIS Tourist SIM
AIS is Thailand’s largest network and the safest pick if you plan to travel beyond Bangkok — its coverage in the far north, on the islands, and in rural areas is generally the strongest of the lot. For a city-only trip you won’t notice the difference, but if Chiang Mai, Pai or a quieter island is on your itinerary, AIS is the dependable choice.
AIS tourist plans span a wide range, from tiny short-stay packages around 49 THB up to larger bundles near 1,599 THB, with the popular tourist SIMs sitting around 299–599 THB for a week or two of generous or unlimited high-speed data. Most tourist packages also throw in a small calling credit (around 100 THB) for local or international calls, plus free calls within the AIS network. You can top up or switch packages anytime through the my AIS app, which is worth installing on arrival.
Activation is instant — your data works the moment the SIM is registered — and the 5G footprint in Bangkok is excellent. If you’re choosing AIS mainly for travel beyond the capital, it’s the one network where you’re least likely to hit a dead spot on a long-tail beach or a winding mountain road up north.
dtac (True-DTAC) Tourist SIM
Since the merger, dtac runs on the combined True-DTAC network, and its tourist SIMs are consistently among the best value in the city. A typical dtac tourist plan starts around 349 THB for roughly ten days, with larger data and unlimited options available for longer stays. Coverage in Bangkok and the main tourist regions is excellent, and speeds are more than fast enough for maps, video calls, streaming and hotspotting a laptop.
For most visitors spending their time in and around Bangkok, a dtac tourist SIM hits the sweet spot of price and performance. If you’re deciding purely on cost for a city-focused trip, it’s hard to beat. The Happy Tourist range is the one to look for, and staff at any True or dtac shop will set it up in minutes.
TrueMove H Tourist SIM
TrueMove H — the other half of the True-DTAC family — is the go-to for heavy data users thanks to its “Thailand Tourist Infinite” plans. These start around 449 THB for eight days and include unlimited 5G data at full speed, unlimited calls to all Thai networks, and often free Wi-Fi access at True hotspots and a calling credit for international numbers. Longer 15- and 30-day versions are available for extended trips.
If you stream a lot, work off a mobile hotspot, or simply don’t want to think about data caps, the True “Infinite” plans are the most worry-free option in Thailand. The network shares True-DTAC’s strong nationwide coverage, so you get speed and reach in one package. It costs a little more than a basic capped SIM, but for digital nomads and remote workers, the peace of mind is usually worth it.
Where to Buy
You have three easy options, and prices are essentially the same at all of them — there’s no airport markup to avoid:
- Airport counters. The fastest route on arrival. At Suvarnabhumi (BKK), you’ll find AIS and True/dtac desks near the arrivals and baggage-claim areas; Don Mueang (DMK) has them too. Staff set everything up, including the mandatory passport registration, before you leave the terminal.
- 7-Eleven. Bangkok has a 7-Eleven on practically every corner, and most sell and register tourist SIMs. Handy if you’d rather sort it out once you’ve settled in, or top up later.
- Official carrier shops. Found in every major mall (Siam, Terminal 21, MBK and others). Best if you want advice, a specific plan, or help with an eSIM setup.
Whichever you choose, bring your passport — Thai law requires every SIM to be registered to a passport, and staff handle this for you on the spot. The whole process takes five to ten minutes.
Tips for Digital Nomads
If you’re staying weeks rather than days, the tourist SIMs still work well — just buy the 30-day unlimited versions — but a few options are worth knowing about.
eSIMs are the most convenient way to arrive already connected, with no queue and no passport desk. Airalo, the best-known marketplace, starts around $4 for a small data bundle and runs up to unlimited plans (roughly $19.95 for 15 days or $34.95 for 30 days on the dtac network). Holafly and Nomad offer competitive unlimited deals, while Ubigi is the pick if you want genuinely uncapped, un-throttled data (around $57.90 for 30 days). Just remember most “unlimited” eSIMs throttle speeds after a daily fair-use threshold — fine for everyday work, less so for constant heavy uploads.
Long-stay value tilts back toward physical SIMs and specialist plans. For months-long stays, a local 30-day unlimited SIM renewed in-country is cheap, and dedicated long-stay eSIMs like Travelsim Asia (around $49.99 for 50GB over 180 days) are excellent for slow travel. If you’re settling in and working remotely, pair a reliable unlimited SIM with good café and coworking Wi-Fi — our best coworking spaces in Bangkok guide covers where to plug in, and the Bangkok digital nomad guide has the full picture on living and working here.
One practical tip if you rely on your connection for work: consider running two SIMs, or a SIM plus an eSIM, on different networks (AIS and True-DTAC). Redundancy is cheap in Thailand, and it means a rare outage or a weak spot never knocks you fully offline in the middle of an important call.
FAQ
Do I need to register my SIM in Thailand? Yes. All SIMs must be registered to a passport by law, but airport, 7-Eleven and shop staff do this automatically when you buy — you just hand over your passport.
Is the airport more expensive? No. Tourist SIM prices are standardised, so buying at the airport costs the same as 7-Eleven or a mall shop. The airport just saves you time on arrival.
AIS, dtac or True — which is best? For Bangkok and the main tourist areas, all three are excellent. Choose AIS if you’re heading to remote islands or the far north, dtac for best everyday value, and TrueMove H “Infinite” if you want guaranteed unlimited high-speed data.
Can I use an eSIM in Bangkok? Yes, if your phone supports eSIM. It’s the easiest way to land already online. For long stays, a physical local SIM is usually cheaper.
How much data do I actually need? For maps, messaging and social media, 15–30GB easily covers a one-to-two-week trip. If you stream, video-call or hotspot a laptop daily, go unlimited.
Will my phone work in Thailand? Almost certainly. Thailand uses standard GSM, 4G and 5G bands that virtually all modern unlocked phones support — just make sure your handset is carrier-unlocked before you travel.
Can I keep my number for a long stay? Yes. Tourist SIMs can usually be topped up or converted to a standard prepaid plan, so you can keep the same Thai number across repeat visits as long as you renew before it expires.
Bottom line: connectivity is one of the easiest parts of a Bangkok trip. Grab a dtac or True tourist SIM at the airport for everyday use, choose AIS if you’re venturing far afield, or load an eSIM before you fly for zero hassle — any of them will keep you online, fast and cheap.
