Best eSIM for Thailand (2026): Prices and Networks for Bangkok and the Islands

What is the best eSIM for Thailand?

The best eSIM for Thailand runs on a network that covers where you are going, holds enough data for your trip, and does not overcharge for it. On November 2, 2026 we read the Thailand pages of seven providers, and 10 GB for 30 days cost between $10 and $13.20. For a two-week trip of maps, messages and social media, a 10 or 20 GB plan is the right size, and a plan that can use more than one Thai network is the safer pick if you are heading to the islands.

Pelesim publishes this blog, so every price below is dated and taken from the provider's own page for you to check. Pelesim sells two kinds of Thailand plan: some run on dtac alone and cost a little less, others can switch between AIS, True and dtac. The tables show both, because that choice matters more in Thailand than the brand on the app.

The short version About 1 GB a day covers most trips: 10 GB for a week, 20 GB for two. Island hoppers should pick a plan that lists AIS as well as True or dtac. Install it at home, and file your Thailand Digital Arrival Card online before you fly.

How much does a Thailand eSIM cost in 2026?

These are list prices in US dollars from each provider's own Thailand page, checked on November 2, 2026. All are 30-day plans unless the cell says otherwise. Prices change often, and Yesim shows crossed-out "was" prices beside the ones it charges; the table uses what it charges.

At 5 GB and 20 GB, Pelesim's dtac plans had the lowest prices in this check. At 10 GB, Nomad was a dollar lower. Above 20 GB the order changes: Airalo sold 50 GB for 30 days at $27.50 and Yesim at $40.80, against $48 at Pelesim, and Nomad sold 50 GB valid for 10 days at $17. If you know you need 50 GB, buy it elsewhere or take a daily plan from the next table.

Holafly sells only unlimited plans for Thailand, so it is in the unlimited table further down rather than here. Ubigi's site showed us one Thailand plan, so its other sizes are marked as not read.

Thailand on its own is much cheaper on a country plan than on a regional one. Pelesim's Asia eSIM covers Thailand and 18 other countries, and its 10 GB, 30-day plan was $36 on the same date. It earns that price only if Vietnam, Malaysia or another country is on the same trip.

Which Thai network does each eSIM use?

Thailand has three mobile network brands: AIS, TrueMove H and dtac. True and dtac merged in 2023, and Opensignal's August 2026 Thailand report says the two finished joining their networks in 2025, while still running separate network policies under each brand. In practice there are two networks with three names: AIS on one side, True and dtac on the other.

A travel eSIM has no network of its own. It connects to one or more of these, and that choice decides your signal more than anything else.

The two networks are close on the measures that matter to a visitor. In Opensignal's data from April to June 2026, dtac had the fastest average download speed at 41.1 Mbps and the top Reliability score, TrueMove H had the best 5G availability, and AIS won both coverage awards and upload speed. None of them is a weak choice. The reason to want two networks is not speed; it is having a second set of masts when the first has none.

What is coverage like on the Thai islands?

Good where people stay. AIS says its 5G reaches more than 95% of Thailand's population, as Opensignal's report notes, and all three brands are built out in Bangkok, Chiang Mai, Phuket, Krabi, Koh Samui and the towns of the busier islands. Population coverage measures where people live, though, not the sea between islands or a national park.

What that means in practice:

• Bangkok, Chiang Mai, Phuket, Pattaya, Krabi town, Ao Nang and Koh Samui. Expect a strong signal on every network in town, at hotels and along main roads.
• Koh Phangan, Koh Tao, Koh Lanta and Phi Phi. Towns and piers are covered. Beaches on the far side of an island, and viewpoints up a hill, are where one network can have signal and the other not, which is where a plan with both AIS and True or dtac pays off.
• Boat days and dive trips. A longtail out to a quiet bay, a snorkelling trip to the outer islands, or a liveaboard in a marine park can be out of range on any network. Download offline maps and your boarding passes before you leave the pier.

Photo by Margo Evardson on Unsplash

On ferries between the Gulf islands (Koh Samui, Koh Phangan and Koh Tao) and on the Andaman side (Phuket, Phi Phi, Krabi and Lanta), the signal comes and goes with the distance from shore. Keep data roaming off on your home SIM while you cross, so a weak signal never hands your phone to a roaming network that bills you.

Fixed data or a daily plan: which suits your trip?

A fixed plan gives you one pot of data for the whole trip. A daily plan, which providers sell as "unlimited", gives you a set amount at full speed each day and then slows you down until midnight. Every unlimited plan for Thailand in our check slows at some point, and the point varies a lot:

Prices are from each provider's Thailand page on November 2, 2026. We could not read Saily's 7-day price from its page.

A daily plan earns its price if you would use more than about 2 GB on most days: long video calls home, streaming in the evening, or a laptop working off your phone's hotspot. For everyone else, a fixed plan is cheaper. Two weeks on Pelesim's 1 GB a day plan costs $23, against $17 or $19 for a fixed 20 GB plan, and most travellers do not use 1 GB every day.

Check the hotspot rule if you plan to share. Holafly allows 1 GB a day of hotspot use. Nomad says hotspot is supported, Pelesim allows hotspot on all its plans, and Yesim says it depends on the operator.

How much data do you need for two weeks in Thailand?

About 20 GB for two weeks of everyday use, and about 10 GB for one. Our data calculator works with three profiles. Light use, about 0.4 GB a day, is maps, messages and some browsing. Everyday use, about 1 GB a day, adds social feeds, sending photos and short videos, and a few video calls. Heavy use, about 3 GB a day, means streaming, long video calls, or a laptop on the phone's hotspot.

These are the totals it gives for each profile, with a 30% margin for slow days, app updates and background use:

Save offline maps for Bangkok and the islands on hotel Wi-Fi, so long drives with the map on screen do not eat into the plan. Most hotels, guesthouses and cafes in Thailand have Wi-Fi, and the real figure falls if you let photo backups and app updates wait for it.

Do you need a Thai phone number?

Most visitors do not. A travel eSIM is data only, which covers maps, WhatsApp, LINE, Instagram, video calls and ride-hailing apps once you are signed in. Your home number stays on your phone's other line, so texts from your bank, airline and apps still reach you.

You need a Thai number in a few specific cases:

• A Thai bank account or a Thai e-wallet. These usually ask for a Thai number. Long stays are where this comes up.
• A business that only takes Thai numbers. Some delivery and local booking apps ask for a +66 number at sign-up.
• Being called by Thai businesses on a normal line. A dive shop or a clinic calling you back will dial a phone number, not an app.

For those, buy a local SIM. True and dtac's tourist SIM terms say each number must be registered with a valid passport under the telecom regulator's rules, that one person can hold three tourist SIMs per brand, and that a tourist SIM's validity cannot exceed 60 days. They are sold at True dtac shops, and the terms put the price and days on the pack rather than the page. Many phones take a physical SIM and an eSIM at the same time, so you can run a Thai SIM for the number and keep a travel eSIM for data.

To ring a Thai hotel, clinic or tour operator that only answers its landline, you do not need a Thai SIM either. A calling app that dials ordinary phone numbers over your data does it, for example CallTuv, which is made by the same company as Pelesim.

Which apps work in Thailand with a data-only eSIM?

All the usual ones. A data-only eSIM is a normal internet connection, so anything that runs over data works: WhatsApp, LINE, FaceTime, Google Maps, Grab, Bolt and banking apps.

The friction is at sign-up, not use. Grab asks for a phone number and sends a code by text the first time you log in. We could not find a Grab help page that says which countries' numbers it accepts, so install Grab and sign in at home with your own number, where a missed code costs nothing and your home line is receiving texts normally. Do the same for LINE if a hotel or tour operator you have booked uses it to message guests.

Thai shops and street stalls often take payment by scanning a Thai QR code. That needs a Thai bank or e-wallet app, or a home app from a country whose payment network the Bank of Thailand has linked to Thailand's. Its October 2025 release, for example, added Alipay, UnionPay and WeChat Pay. If your bank app is not on that list, carry some cash and a card.

Photo by Evan Krause on Unsplash

Can you just roam with your home SIM?

You can, at your carrier's price. AT&T's International Day Pass is $12 a day, plus $6 for each extra line used that day, which comes to $168 for two weeks on one phone. A 20 GB eSIM for the same two weeks costs $17 to $20.40 in the table above. Many other carriers sell a similar daily pass, so check yours before you assume roaming is cheap.

Whatever you choose, turn data roaming off for your home line once the eSIM is installed. Our guide on whether to turn data roaming on or off explains which line needs it and why the setting causes most surprise bills.

If you are travelling with family and want one connection for several devices, a pocket WiFi router is the other option; our comparison of eSIM and pocket WiFi covers when it makes sense.

Which plan fits which trip?

Most providers in our check sell top-ups, Pelesim included, so the cheaper move is to buy for your expected use and add data if you run low, rather than paying in advance for your worst case.

How do you install the eSIM before you fly?

Install it at home, on Wi-Fi, a day or two before you leave. Pelesim plans do not start counting days until the eSIM first connects to a network in Thailand, so installing early costs nothing, and you have at least 180 days from purchase to install it. Some providers start the clock at install or after a set number of days, so check that line in the plan details before you buy.

1. Check that your phone supports eSIM, using our supported device list, and that it is carrier unlocked.
2. Buy the plan, then scan the QR code from another screen, or use the install button if you bought on the phone itself. The iPhone install guide shows each screen.
3. Name the new line "Thailand" so you can tell your two lines apart.
4. File the Thailand Digital Arrival Card while you are still on home Wi-Fi. Thailand's Immigration Bureau says every passenger must complete it, foreigners within the 3 days before their arrival date, and the official site charges no fee.
5. On arrival, choose the Thailand line for mobile data and turn on data roaming for that line only. On iPhone both are under Settings > Cellular, which some regions call Mobile Data. Leave data roaming off on your home line.
6. If the phone shows signal but no data, pick a network by hand. On iPhone it is Settings > Cellular > your Thailand line > Network Selection, then turn off Automatic. On Android, look for Network operators or Automatically select network in that SIM's settings. Choose one of the networks your plan lists, then restart the phone.

What changes and what does not?

Prices change. The tables above are a snapshot from November 2, 2026, and travel eSIM prices move without notice, so check the date on any comparison you read, this one included.

Network names are changing too. True and dtac now run one combined network under two brands, and provider pages list them in different ways, so read "True", "TrueMove H" and "dtac" as the same side of the market and AIS as the other.

What does not change is how to choose: size the plan to your days and your habits, pick two networks if you are going to the islands, and compare the price per GB rather than the headline price.