Reliable data makes Thailand easier: Grab rides, Google Maps, translation, hotel check-ins, TDAC PDFs, ferry tickets and restaurant searches all depend on your phone. The good news is that Thailand has fast, cheap mobile data almost everywhere travellers go.
Best networks in Thailand
- AIS: usually the best overall coverage, especially outside major cities.
- True: excellent city speeds, strong 5G in Bangkok and tourist zones.
- dtac: now merged with True in many operations, still common for tourist SIMs.
Airport SIM vs eSIM
Airport SIM cards are convenient. You walk out connected, but prices are usually higher than city shops. eSIMs can be bought before departure and activated when you land. They are perfect if your phone supports eSIM and you want to avoid queues after a long flight.
Typical tourist packages
- 7-8 day unlimited data packages: usually 300-600 baht.
- 15 day packages: usually 600-900 baht.
- 30 day packages: usually 900-1,500 baht depending on speed and data cap.
Where to buy
You can buy tourist SIMs at Bangkok BKK, Don Mueang, Phuket, Chiang Mai, 7-Eleven stores, branded AIS/True shops and shopping malls. Bring your passport, because SIM registration is legally required.
Phone compatibility
Make sure your phone is unlocked. If you are using an eSIM, check that your model supports it before buying. Dual SIM travellers can keep their home WhatsApp number active while using Thai data for internet.
Which option is best?
- Short city trip: eSIM or airport SIM is easiest.
- Island hopping: AIS usually has the safest coverage.
- Remote north or national parks: AIS again tends to perform best.
- Budget backpacking: buy in a city mall instead of the airport.
Useful apps once connected
- Grab or Bolt for rides.
- Google Maps with offline areas downloaded.
- Google Translate with Thai offline pack.
- LINE for local communication.
- 12Go for transport booking.
Don't forget your TDAC PDF
Even with a SIM, save your TDAC confirmation offline before boarding. Airport Wi-Fi can fail, batteries can die, and immigration is smoother when your QR code is ready.