The quick verdict
An eSIM is the simplest way to land connected, especially if you're island-hopping and don't want to hunt for a SIM kiosk.
Get an eSIM for Thailand ↗
Airalo sells a local Thailand eSIM — pick it on their store. Some links here are partner links: if you buy through them, Diaries of Travels may earn a commission at no extra cost to you. We only point to a service when it matches the advice on the page, and a commission never changes what we recommend. Disclosure →
What to expect
- Coverage
- Thailand has strong, cheap coverage across Bangkok, Chiang Mai and the main islands.
- Networks
- Runs on AIS, TrueMove H or dtac.
- Data for a week
- 5 GB for a week is comfortable; go bigger if you'll stream or tether on long ferry and bus days.
- Good to know
- Coverage thins on remote islands and in the far north — download offline maps before you leave the mainland.
eSIM, local SIM or roaming?
For most trips to Thailand, an eSIM is the simplest choice: you buy and install it before you fly, then land already online. A local SIM can be cheaper for very long stays, but means queuing at the airport and sometimes registering ID. Your home carrier's roaming is the most expensive option and worth avoiding unless your plan already includes Thailand.
How to set up your Thailand eSIM
- Check your phone. It needs to be eSIM-compatible and carrier-unlocked. Most phones from the last few years qualify.
- Buy the Thailand eSIM before you fly, while you still have Wi-Fi at home.
- Install it over Wi-Fi. A one-tap install or a QR code adds it as a second line — your home SIM stays in place.
- Land and switch on. Turn on data roaming for the eSIM line only. It connects to a local network automatically.
- Keep your number. Leave your home SIM active for calls and texts, and use the eSIM for data.
One honest caveat
Coverage, plans and prices change, and networks vary by region within Thailand. Always download offline maps for anywhere remote, and check your phone supports eSIM before you buy.