Whether it's temples in Bangkok, islands in the south or the hills around Chiang Mai, you want data sorted before you travel — for maps, Grab rides, hostel check-ins and the family chat. A travel eSIM for Thailand does exactly that: a data-only line you install before you fly, with no airport-SIM queue to join.
This guide covers how a Thailand eSIM works, what it costs, how much data to buy, and how to set it up in minutes.
Why an eSIM beats roaming (and the airport SIM)
Roaming in Thailand on a European plan is costly, and buying a local SIM at the airport means a queue, your passport, and swapping out your home SIM — which loses you your number until you swap back.
A travel eSIM avoids both. Your home SIM stays in the phone for calls and texts on your usual number; the eSIM carries the data on a major Thai network, installed before you board.
eSIM Thailand: prices and plans
Plans are data-only and pay-as-you-go — no contract, no auto-renewal. Pick a data size and a validity window, pay once, done. Sizes run from small day plans up to larger multi-gigabyte plans for longer island-hopping trips, and you can top up from your phone if you run low.
Prices start at a few euros. The live price is shown on the Thailand eSIM page, and the plan card at the foot of this guide shows the current "from" price.
Coverage and speed
Horizon's Thailand plans run on a major local network. Where that operator offers 5G you may get it, and coverage and speed depend on local network conditions across Bangkok, Phuket, Koh Samui, Chiang Mai and the routes between. Hotspot and tethering are supported where the selected plan and your device allow it — useful for sharing with a travel buddy or a tablet.
How much data do you need?
For a typical one-to-three-week trip:
- Light (maps, messaging, the odd call): 3–5 GB.
- Normal (Grab rides, photos, video calls home, scrolling): 8–12 GB.
- Heavy (hotspot, lots of streaming, remote work): 15 GB or more.
Start modest if you're unsure — you can top up in a minute. See how much data you need for a breakdown by activity.
Set up your Thailand eSIM in three steps
Do it on Wi-Fi at home before you travel:
- Buy and install the Thailand eSIM — you'll get a QR code by email. Scan it to add the data line (check your phone is eSIM-compatible first).
- Leave it switched off until you arrive — on these plans the clock can start as soon as the eSIM first connects to a Thai network, so check the plan details before installing early.
- Turn on the data line when you land and set it as your mobile data. Keep your home SIM on "calls and texts only" so nothing roams in the background.
The full walkthrough is in how to install an eSIM.
Frequently asked questions
Which eSIM is best for Thailand? The one that matches your trip length and data habits. A single-country Thailand eSIM is simpler than a global plan when Thailand is your only stop, and it keeps your own number in place.
Does an eSIM work in Thailand? Yes — modern iPhones and most recent Android flagships support eSIM, and Thai networks carry the data. Check the supported devices list if you're unsure about your phone.
Do I keep my phone number? Yes. The eSIM is a separate data line; your home SIM stays in the phone for your usual number, calls and SMS.
Can I use it as a hotspot? Yes, where the selected plan and your device allow it — you can share with another phone, a tablet or a laptop.
The short version
Buy a Thailand eSIM before you fly, install it on Wi-Fi, and switch it on when you land. You keep your number and pay a few euros for the data you need. New to eSIMs? Start with what is an eSIM, then grab your Thailand plan.
