Three ways to get online in Thailand: a travel eSIM, a local AIS/dtac/TrueMove SIM, or roaming. The honest truth, unlike some countries, Thailand's local SIMs are genuinely good and cheap. So this comes down to convenience vs a Thai number. Here's the straight comparison.
The short version
| Travel eSIM (Thailand eSIM) | Local AIS / dtac SIM | Home roaming | |
|---|---|---|---|
| Online on arrival | Yes (install before you fly) | After the airport counter | Yes |
| Registration | None | Passport (quick, at counter) | None |
| Thai phone number | No (data + internet calls) | Yes | No |
| Price | Competitive (10 GB $8.70) | Cheap (e.g. ~$9.90/10d unlimited) | Often expensive |
| Coverage | Major networks (AIS-grade for islands) | Excellent (AIS best for islands) | Your carrier's partner |
| Best for | Convenience, no queue, no registration | Lowest cost + a Thai number | Quick hops |
What a local Thai SIM gets you
Credit where it's due: Thai tourist SIMs are excellent value. A dtac "Happy Tourist" eSIM gives unlimited data and a Thai number for around $9.90/10 days; AIS has the best island coverage. The trade-offs are minor:
- You buy it after you land, at an airport counter (a short queue after a long flight).
- You must register with your passport (quick, but required for all Thai SIMs).
What a travel eSIM gets you
- Online the moment you land, no counter, set up before you fly.
- No registration, nothing to show or scan.
- One plan, all of Thailand, cities and islands.
- Keep your home number in the phone for calls/texts.
The catch: a travel eSIM is data-only (plus internet calls like WhatsApp). If you need a Thai phone number, a local SIM is the way.
What roaming gets you
Roaming keeps your number with zero setup, but daily fees and caps make it pricey for more than a quick trip. Fine as a fallback.
AIS vs dtac vs TrueMove
- AIS, best island and rural coverage; ideal for Phuket, Samui and the south.
- True/dtac, strong city coverage (Bangkok ~99% 5G); the "Happy Tourist" eSIM is great value.
- TrueMove H, part of True Corp; solid in cities.
A Thailand eSIM rides this same infrastructure, choose one with AIS-grade routing for islands. More on that in our Thai islands coverage guide.
So which should you choose?
- Want zero hassle and no Thai number? A travel eSIM, online on arrival, no counter, no registration.
- Want the lowest price and a Thai number? A local AIS/dtac SIM.
- Quick hop, cheap home plan? Roaming as a fallback.
FAQ
Is an eSIM or a local SIM better for Thailand? Both are good. An eSIM wins on convenience (online on arrival, no counter, no registration); a local SIM is cheap and gives a Thai number.
AIS, dtac or TrueMove, which is best? AIS for islands and rural areas; True/dtac for cities. A Thailand eSIM that rides AIS-grade coverage is best for island trips.
Do I need to register my passport for a Thai SIM? Yes for any local SIM (quick, at the counter). A travel eSIM needs no registration.
Can I get a Thai phone number with an eSIM? A travel eSIM is data only. For a Thai number, use a local AIS/dtac SIM.
Is the dtac Happy Tourist SIM good? Yes, great value (unlimited + a Thai number ~$9.90/10d). A travel eSIM is the better pick if you'd rather skip the counter and registration.
Bottom line
Thailand's local SIMs are genuinely good, so it's convenience vs a Thai number. If you want to land already online with no counter and no registration, Thailand eSIM is the better choice; if you need a Thai number, go local. See the full guide: best eSIM for Thailand.