For most trips to Thailand, the best eSIM is a single data-only plan that rides on AIS with True and dtac as automatic fallback. These are the country’s three biggest networks, so coverage matches what locals get. Plans start at $4.00. From there, prices climb to 10 GB or more, and the biggest plans run up to 30 days. You scan a QR code to install the eSIM. Hotspot works on every plan. Activation does not require a passport upload or a local address. The cheapest option is $4.00. You don’t need a passport upload or a local address to activate it. All plans support hotspot. Coverage includes three networks. Prices change, so instead of pasting a table that goes stale, check the live list on the Thailand eSIM page at travelydata.com/product/thailand-travel-esim-data-card/. Check live prices.
| Feature | Details |
|---|---|
| Network | AIS (primary), True + dtac (backup) |
| Speed | 5G where available, otherwise 4G LTE (subject to carrier Fair Usage Policy) |
| Activation | QR code scan, no physical SIM |
| Hotspot | Yes, on every plan |
| Validity | 7 to 30 days |
| Registration | No passport or ID for tourist data plans |
How much does a Thailand eSIM cost?
The cheapest option is $4.00. From there plans climb to 10 GB or more, and the biggest ones run up to 30 days. Prices change, so instead of pasting a table that goes stale, check the live list on the Thailand eSIM page.
Which network does a Thailand eSIM use?
AIS supplies the main network, and the eSIM falls back to True or dtac when AIS drops out. That triple covers Bangkok, the islands and the north far better than a single-carrier SIM. 5G comes through in the cities; elsewhere you sit on 4G LTE, which handles maps and messaging without a problem.
How much data do you actually need?
Navigation eats about 100 MB a day. Messaging and social media add another 150–200 MB. A normal week of maps, LINE and the occasional photo upload lands around 2–3 GB total. Video is the exception: an hour of streaming is roughly 1 GB, and that changes the math fast.
When is unlimited data worth it?
Only when you know you’ll stream or tether. If you’re on maps and messaging, unlimited is money you won’t use. But if you’re working remotely and hotspotting a laptop every day, a larger or unlimited plan is cheaper than buying a small one and running out.
Dual-SIM: keep your bank OTPs
A data-only eSIM leaves your physical SIM slot free, so your home number keeps receiving bank verification texts at no extra cost. That’s the setup to use if your bank still sends one-time passwords by SMS.
Arrival and getting around
From Suvarnabhumi or Don Mueang, the Airport Rail Link or a Grab ride reaches the city. In Bangkok, the BTS Skytrain and MRT cover most of the city, and the Grab app is the standard way to book rides and food nationwide. Between regions, cheap domestic flights and night buses are the norm. Apple Maps and Google Maps both work well for directions.
How to install and activate
- Scan the QR code from your order email under Settings → Cellular → Add eSIM.
- Label the plan so you can tell it apart from your home SIM.
- Turn on data roaming for the eSIM once you land. The plan starts counting from the first connection.
Will my phone work with it?
Any carrier-unlocked phone that supports eSIM will work: iPhone XS or newer, Pixel 3 or newer, and Samsung Galaxy S20 or newer are the common ones. If your phone is locked to a carrier, unlock it first or the install will fail at the QR step.
Frequently Asked Questions About Thailand eSIMs
Q1: Do I need to register with a passport?
No. Tourist data plans don’t ask for a passport upload or a local address under current carrier rules. Local rules can change, so it’s worth a quick check before you go.
Q2: Which network does the eSIM connect to?
AIS is the primary network, with True and dtac as backup. Your phone picks whichever has the strongest signal in that spot.
Q3: Can I use it as a hotspot?
Yes, hotspot and tethering are enabled on every plan. A laptop or a second phone can share the connection.
Q4: Will I get 5G everywhere?
5G appears where the local network has it — mostly Bangkok, Chiang Mai and Phuket. In between you’ll sit on 4G LTE, which handles navigation and messaging without a problem.
Q5: When does the plan start counting?
From the first connection to a Thai network after landing, not from the moment you scan the QR code. Install it at home on Wi-Fi and activate on arrival.
Q6: Does it work outside Bangkok?
Yes. AIS, True and dtac cover the whole country, including the islands and rural areas, so you stay connected beyond the big cities.
Q7: Can I top up or extend it?
Topping up depends on the plan. The simplest option is to buy a longer plan up front if your dates are fixed; check the live plan list for what’s available.
Q8: Do I need a Thai phone number?
No. The eSIM is data-only, so you won’t get a Thai number, but LINE, WhatsApp and maps cover calls, messaging and navigation. Keep your physical SIM for bank OTPs.
Q9: Does it work alongside my physical SIM?
Yes. Modern phones run dual-SIM, so the eSIM handles data while your home SIM stays active for texts and calls at no roaming cost.
Q10: What’s the refund policy?
Refunds depend on whether the plan has been activated. If you buy and don’t install it, you’re usually covered; once it’s active, it’s non-refundable. The full terms are on the product page.
Bottom line
For a Thailand trip, a single data eSIM on AIS is the least-fuss option, and 3 GB covers a normal week for most people. Pick the size that matches your video habit, install it before you fly, and you’ll have signal the moment you land. See the current plans here.
Prices and coverage verified on travelydata.com, September 2026.
