Thailand stretches for thousands of kilometers — from Bangkok to the islands of Phuket and Koh Samui — and network quality varies by region. Here's which eSIM to get so your internet works in the city and on the beach alike.
For a week in Bangkok or Pattaya with navigation, ride-hailing apps and social media, 3–5 GB is usually enough. For a longer multi-island trip (Phuket, Koh Samui, Krabi, Koh Phi Phi) with maps and on-the-spot bookings, get 10 GB or more.
4G/5G coverage is solid in Bangkok, Chiang Mai and Phuket, on par with major cities elsewhere. On less touristy islands and remote parts of Krabi or Koh Phi Phi, speeds can drop — worth keeping in mind if you plan to work remotely.
Install the eSIM at home ahead of time so you have internet the moment you land, instead of hunting for a SIM card counter at Bangkok or Phuket airport. Only turn on data roaming once you've landed.