Thailand is one of the best-connected travel destinations in Asia: Bangkok, Chiang Mai, Phuket and the main islands all have excellent 4G and growing 5G, and data is cheap. The choice is mostly between installing an eSIM at home and queueing at an airport SIM counter.
Short answer: a travel eSIM installed before you fly gets you online at Suvarnabhumi with no queue. Pick validity that covers your trip — the cheapest large bundles in Thailand often last only five days.
What a Thailand eSIM costs
At the time of writing (October 2026), Wanderly's Thailand plans start at $2.99, and 10GB costs around $6. The median across data-only Thailand plans is about $0.70 per GB — well under the $1.43 median across 187 countries in the Wanderly eSIM Price Index. Full options on the pricing page.
Comparing providers? See Thailand vs Airalo and Thailand vs Holafly.
eSIM vs an airport SIM
Thai tourist SIMs from AIS, TrueMove H and others are sold at the airport and must be registered with your passport at the counter. They are good value but mean a queue after a long flight, and swapping out your home SIM. A travel eSIM installs at home, works the moment you land, and lets you keep your home number on the other line.
Networks and coverage
Wanderly's Thailand plans run on AIS or TrueMove H, Thailand's two largest networks.
- Bangkok: excellent 4G and 5G, including the BTS Skytrain and MRT.
- Chiang Mai and Chiang Rai: good in the cities; weaker on mountain roads and around Pai.
- Phuket, Krabi, Ao Nang: good coverage.
- Koh Samui, Koh Phangan, Koh Tao: good in the main towns and beaches.
- Phi Phi and island-hopping boats: coverage near the islands; patchy in open water.
- Khao Sok: limited inside the park and on the lake.
How much data you need
| Trip | Suggested data |
|---|---|
| Bangkok long weekend | 1–3 GB |
| One week | 5 GB |
| Two to three weeks, islands and north | 10 GB |
| Remote work in Chiang Mai | 20 GB+ |
Grab, Bolt, maps and LINE (widely used in Thailand) are light. See how much data you need for travel.
Thailand on a Southeast Asia trip
Crossing into Malaysia, Laos or Cambodia? A Thailand plan will not cover those. See the best eSIM for Malaysia, the best eSIM for Vietnam and the best eSIM for Southeast Asia.
Setting it up
- 1Confirm your phone supports eSIM and is unlocked on our compatibility checker.
- 2Install the eSIM over WiFi before you fly — iPhone or Android steps.
- 3On landing, select the eSIM for mobile data and turn on data roaming for that line.
- 4Keep your home SIM for calls and texts — see the dual-SIM guide.
FAQ
What is the best eSIM for Thailand? For most travellers, a plan of 5–10GB with validity covering the whole trip.
How much does an eSIM for Thailand cost? Wanderly Thailand plans start at $2.99, with a median of about $0.70 per GB.
Which networks do Thailand eSIMs use? Wanderly's Thailand plans connect to AIS or TrueMove H.
Does an eSIM work on the Thai islands? Yes, in the main towns and beaches of Phuket, Samui, Phangan, Tao and Phi Phi. Open-water boat trips can lose signal.
Is an eSIM better than a Thai airport SIM? It avoids the queue and passport registration, and keeps your home number available. Airport SIMs can be good value for long stays.
Heading into Laos by rail or slow boat? See the best eSIM for Laos.