Best eSIM for Thailand: AIS, TrueMove or dtac — and how much data you really need
Thailand has cheap, fast mobile internet, but tourist SIMs mean queues and passport scans. A travel eSIM gets you online before you land in Bangkok or Phuket.
Thailand is one of the easiest countries in the world to stay connected in: dense 4G/5G in Bangkok, Chiang Mai, Phuket, Krabi and Koh Samui, and reasonable coverage on most islands. The catch for visitors is the airport SIM counter — queues, passport scans and a pushy upsell — and the fact that your European plan almost certainly charges expensive roaming here.
AIS vs TrueMove H vs dtac
- AIS — the largest network, best rural and island coverage, strong 5G in Bangkok. The safest choice for beaches and the north.
- TrueMove H — excellent in cities and tourist areas, good 5G; merged with dtac in 2023, so coverage now combines both footprints.
- dtac — now part of True; plans still branded dtac use the same combined network.
Travel eSIMs for Thailand typically connect to AIS or True. Either is fine in tourist areas; for Koh Tao, Koh Lanta or northern trekking, AIS has the edge.
How much data?
Grab (rides and food), Google Maps, translation, Instagram and video calls home are the main consumers. Most travellers land around 1 GB per day; digital nomads working from cafés use 3–5 GB per day.
| Trip | Recommended plan |
|---|---|
| Bangkok stopover (2–3 days) | 3 GB · 7 days |
| Two-week island holiday | 10–20 GB · 30 days |
| Month-long trip or remote work | Unlimited · 30 days |
| Thailand + Vietnam + Bali | Asia regional plan |
Practical tips
- Hotspot: handy for a laptop in a beach café; make sure the plan lists Hotspot.
- Speed: 5G is available on AIS and True in major cities; 4G is fast everywhere else.
- Validity: starts on first connection in Thailand. Install at home, switch on at Suvarnabhumi (BKK), Don Mueang (DMK) or Phuket (HKT).
- Immigration: Thailand's digital arrival card needs internet at the airport — one more reason to have the eSIM ready before landing.
- Islands and ferries: coverage drops on some ferry crossings and on the far side of smaller islands; download offline maps for those days.
eSIM vs airport SIM
A tourist SIM at BKK costs about the same as an eSIM but requires passport registration, a queue after a red-eye flight, and swapping your physical SIM (easy to lose). With an eSIM your own number stays active for banking codes and family calls, and everything is set up before take-off.
FAQ
Which network is best for the Thai islands?
AIS has the widest island and rural coverage; True is excellent in cities and main tourist areas. Both work well in Phuket, Samui and Krabi.
Does a Thailand eSIM work in Vietnam or Bali?
No — choose an Asia regional plan if you are visiting several countries on one trip.
Is there 5G in Thailand?
Yes, AIS and True offer 5G in Bangkok and major cities. Plans marked 5G will use it where your phone supports it.
Do I need internet to fill in the Thailand arrival card?
The digital arrival card is completed online before or at arrival, so having data as soon as you land is genuinely useful.
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