Thailand eSIM Guide: Data in Bangkok, Phuket and the Islands
Skip the airport SIM queue in Thailand: networks, island coverage, data needs for Grab and maps, and tips for multi-country Asia trips.
Thailand offers a route from Bangkok’s busy streets to the beaches of Phuket, Krabi and Koh Samui. The tourist SIM queues at Suvarnabhumi can be long; with an eSIM you skip them and book a Grab the moment you land.
Networks and coverage
AIS and True (now merged with dtac) are the largest carriers, with NT also providing infrastructure. Bangkok, Chiang Mai, Pattaya and the popular islands have strong 4G/5G. Signal may weaken on remote islands, boat trips and in national parks.
How much data do you need?
| Trip | Suggested plan |
|---|---|
| One week, Bangkok + one island | 10 GB |
| Two weeks, several islands | 15–20 GB |
| Digital nomad, long stay | Unlimited or 30 GB+ |
Practical tips
- Grab, Bolt and Google Maps stay open throughout the trip; plan on 300–500 MB a day.
- Before boat trips, put your phone in a waterproof pouch and save key information offline.
- If Vietnam, Cambodia or Malaysia are also on your route, Asia plans cover them with one QR code.
Frequently asked questions
Does a Thailand eSIM work on small islands like Koh Phi Phi?
Popular islands usually have good coverage; there may be gaps on boats or in remote coves.
Is an unlimited plan really unlimited?
Some unlimited plans reduce speed after a certain amount of usage. Fair-use terms are listed on the plan page.
