Best eSIM for Thailand (2026): data, networks and tips

eSIM, airport SIM or roaming?

• Travel eSIM: installed at home, works on arrival, your own SIM stays active. No queue, no passport copy at a counter.
• Airport SIM: works well, but you queue after a long flight and pay airport prices. You also need a free SIM slot.
• Roaming on your home plan: Thailand is outside the EU, so roaming is often expensive unless your provider has a special travel pass.

Networks and coverage

Thailand's main networks are AIS and True (which merged with dtac). Both cover Bangkok, Chiang Mai, Phuket, Krabi, Koh Samui and the other popular islands well. Coverage gets patchier on remote beaches, small islands and in national parks, so download offline maps for those days.

How much data do I need for Thailand?

• Maps, Grab and messaging: about 0.5 GB a day.
• Plus social media, photos and the odd video: about 1 to 2 GB a day.
• Lots of streaming, video calls or a laptop hotspot: an unlimited plan is the stress-free choice.
• Two weeks of normal use: 10 to 20 GB is a comfortable amount.

Apps you'll use (and need data for)

• Grab or Bolt: taxis and scooter rides at fixed prices, usually cheaper and easier than street taxis.
• Google Maps: for songthaew routes, ferry piers and finding food.
• Google Translate: point your camera at menus and signs.
• LINE: many hotels, guesthouses and tour operators in Thailand use it for messages.

Useful to know

• Tourist police: 1155, English-speaking and available 24/7.
• Thailand has two rainy seasons: the Andaman coast (Phuket, Krabi) is wettest from about May to October, the Gulf coast (Koh Samui, Koh Phangan) from about October to December.
• When an ATM offers to convert to your home currency, choose the local currency (baht) for a better rate.
• Install the eSIM at home on WiFi and turn on data roaming for the eSIM when you land.