eSIM, SIM card or roaming: the comparison
| Option | Who it suits | Indicative price | Good to know |
|---|---|---|---|
| Data eSIM | Recent, unlocked phone, night arrival | About 15 to 20 dollars for 20 GB over 30 days with the main resellers (October 2026) | No local phone number; install before the flight |
| Tourist SIM card (AIS, TrueMove, dtac) | Long stays, heavy data use, local calls | About 299 to 599 baht for the usual plans; up to about 1,200 baht for 30 days unlimited at the airport | Passport required; cheaper in a shop or 7-Eleven than at the airport counter |
| Your own operator's roaming | Very short stay, plan already included | Highly variable | Check non-EU rates before you leave |
Prices change often: check the rate on the day you buy.
Which network in Phuket and on the islands
The three Thai operators (AIS, TrueMove and dtac) cover Phuket, Patong, Kata, Karon and Phuket town well. AIS is generally described as the widest; dtac is often cited for the islands. 4G is enough for maps, messaging and streaming; 5G is still limited to big cities and many foreign phones cannot pick it up. On a boat, off the Phi Phi or Similan islands, the signal can disappear: download your maps offline before you leave.
How to install it without mistakes
- Check that your phone supports eSIM and is not locked to its operator.
- Buy and install the eSIM before you leave, on Wi-Fi, but only switch the data line on when you arrive: validity often starts at installation or at the first connection, depending on the seller.
- On arrival, turn on data roaming for that line and keep your main line for calls and texts.
- If you prefer a SIM card, buy it in a shop or at the Phuket airport counter; registration with your passport is compulsory.
Pitfalls to avoid
A data eSIM does not receive your bank's text messages on your usual number: keep your main SIM active with limited roaming or over Wi-Fi. Beware of "unlimited" plans with a fair-use limit: read the full-speed cap. For getting around the island, a data plan also lets you use ride-hailing apps; see getting around Phuket. For everyday pitfalls, read scams in Phuket.
FAQ
Do I need an eSIM for Thailand?
No, but it is the simplest way to have data on arrival without going to a counter. Wi-Fi is common in hotels and cafés.
Is my phone compatible?
Most iPhones from the XS onwards and many recent Android phones accept eSIM; it must be unlocked. Check in your phone's settings.
How many GB should I plan?
For browsing, messaging and photos, 10 to 20 GB is enough for one to two weeks; more if you share your connection.
Can I make calls with a data eSIM?
Not with a Thai number: use app calls (WhatsApp, Line, FaceTime).
