In this article:
A tourist SIM card in Thailand suits you if its validity, services and coverage match your travel plans and your phone supports the chosen format. Start with whether you need a Thai number, then check device compatibility, the high-speed data allowance and connection terms. The lowest price alone does not answer the question of which plan to choose.
A physical SIM and an eSIM are connection formats. A local tourist plan and an international travel eSIM (travel-eSIM) are different offers: compare their services and limits, not just how they are installed.
Below are the specific packages and the order of checks before payment. General questions are covered in a separate guide mobile service and internet in Thailand.
Current as of publication. Prices and terms may change; check them with the operator or seller before buying.
SIM Card for Tourists in Thailand: Where to Start Choosing
The logic is simple: do you need a Thai number → does your phone support eSIM → what validity period and high-speed data volume do you need → where you will use the connection. High-speed data is the amount of traffic for which the plan provides the advertised maximum speed.
According to the operator (dtac), an eSIM uses technology built into the device, so no separate physical card is needed. But the connection format alone does not determine coverage, whether you get a number, or whether calls are available.
| Option | Who it suits | What to check | Possible limitations |
|---|---|---|---|
| Physical SIM from a local operator | For those who choose a separate card | Phone compatibility, plan and registration | Device and plan terms |
| Local eSIM | For those whose phone supports this format | The exact model, registration and setup | Regional device variations |
| International travel eSIM (travel-eSIM) | For those considering an international service offer | Network, number, calls, messages and support | Terms of the specific product |
Check the number and voice services separately. A SIM with a Thai number does not necessarily allow regular outgoing calls, and an international offer should not be assumed in advance to be an internet-only package.
Operator plans: comparing prices and terms
As of November 2026
Compare internet plans in Thailand using the same criteria: validity period, price, high-speed data allowance and the services you need. Purchase conditions matter too, especially for partner promotions.
| Offer | Plan validity | Price | Confirmed contents | What to note |
|---|---|---|---|---|
| AIS tourist plan | 8 days | 499 baht | Unlimited data at maximum speed according to the operator’s description; 100-baht bonus | The bonus is not a discount on the purchase |
| AIS tourist plan | 15 days | 699 baht | Validity and price confirmed | Check other details separately |
| eSIM (dtac Happy Tourist 299) | 8 days | 299 baht | 15 GB at maximum speed | Check the speed after this allowance in the terms |
| eSIM (dtac Happy Tourist 599) | 15 days | 599 baht | 30 GB at maximum speed | All traffic cannot be considered unlimited at maximum speed |
Conditional offer for passengers of partner airlines
| Offer | Plan validity | Price | Confirmed contents | What to note |
|---|---|---|---|---|
| Partner promotion plan (True Infinite) | 8 days | 449 baht; the regular price on the page is 499 baht | Price and validity confirmed | The offer is aimed at passengers of partner airlines |
The operator’s (True) partner promotion period — from May 1 through December 31, 2026. Additional benefits apply to purchases of the Infinite plans listed in the promotion; check whether you can use the offer before paying.
Check the current price and contents of the plan before buying. AIS offers can be checked on the official AIS tourist plans page.
The difference is already visible in the table: the same validity period does not mean the same contents. AIS bonuses cannot be subtracted from the price, and another plan’s stated high-speed allowance should not be turned into a promise of unlimited maximum speed.
Before paying, ask the seller these questions:
- Is there a Thai number and outgoing calls?
- Is receiving messages available?
- Is internet tethering allowed?
- Are there purchase restrictions?
- Does the available payment method work for you?
How to check coverage along your route
Check the network where you will live and use the internet: at your accommodation, along the way between stops, and at places where you have important calls. The name of an island or city is too broad to promise a stable signal in a specific room.
The operators (True-dtac) warn that actual speed depends on coverage, the number of active users, device compatibility and other conditions. The eSIM format does not cancel these factors.
Before buying, look up coverage information for the network you choose and confirm connection conditions at your accommodation address. An answer about how the network works in a specific place is more useful than a general claim of being the ‘best operator in the country.’
If you need a laptop for work, check tethering and connection requirements separately. To prepare a work setup, see the guide internet for remote work.
How to check whether your phone is compatible with an eSIM
Check the exact model and sales region of the phone, not just the product line name. It is better to confirm eSIM support and the limits of the chosen offer before paying.
The manufacturer (Apple) lists the iPhone XS, XS Max, XR and later models among the requirements for a tourist eSIM. However, regional differences and whether the service provider supports it must be considered: the model name is a guide, not a universal guarantee.
To use such a smartphone with another carrier abroad, it must not be locked to a carrier. Installation also requires a connection to a wireless network (Wi-Fi) or a hotspot.
On phones running Android, check your specific device against the manufacturer’s documentation and the seller’s terms. There is no universal list of models or identical menu names for all devices.
Add this check to the list of what to prepare before traveling to Thailand. So the compatibility question will be settled before choosing and paying for a plan.
Where to buy and register a tourist SIM
Compare buying online from the operator, visiting a service center and buying at the airport. For an online offer, find out in advance how to receive, register and install it; when buying on the spot, check that the needed plan is in stock and that you can test the connection before leaving.
The operators (True-dtac) report selling tourist SIMs at service centers nationwide and around the clock at airport outlets. This statement does not confirm the opening hours of every counter of all operators.
Tourist SIMs of the brands (True) and (dtac) require a valid passport, and the limit is 3 SIMs per person for each brand. Do not automatically apply these conditions to every international service.
Registering a SIM in Thailand and choosing a plan are separate checks. Before leaving the sales point, make sure the connection works, the right plan is selected and the paid services are available; ask a staff member for help with setup.
If you plan to buy after landing, look in advance at what to do at the airport after arrival. This will help you fit getting connected into your other tasks.
Unlimited, speed reduction and tethering
The word “unlimited” alone is not enough. Shared access, high-speed data volume and tethering are different terms, which should be read separately.
The dtac eSIMs for 8 and 15 days list 15 and 30 GB at maximum speed, respectively. The word “Unlimited” next to these specifications does not mean unlimited traffic at maximum speed. Check the speed after the high-speed allowance with the seller.
A fair use policy (FUP) may provide for reduced speed. The service (Holafly) explains that some operators may apply it after a certain amount of high-speed data, especially under heavy load. This explanation does not establish identical restrictions for all tourist plans.
The same service warns that unlimited internet in certain destinations does not mean an unlimited hotspot. If you need to tether internet in Thailand, check its permission, available volume and speed specifically for the chosen plan.
Put simply, a promise of internet on your phone does not yet answer how a laptop will work. Find out the tethering terms before buying.
How to use a Thai SIM and a home SIM at the same time
First check whether your phone supports the required combination of lines. Then divide the tasks: the tourist line for internet, and the home line for the calls and messages you need, subject to its operator’s terms.
Order of checks:
- Assign the appropriate line for mobile data.
- Check the line selection for calls and messages.
- Confirm your home operator’s roaming terms.
- Check whether automatic mobile data switching is available and how it behaves.
- Make sure the home line can receive the messages you need.
According to the manufacturer’s documentation (Google), on Pixel phones only one SIM can be the primary one for mobile data. There is no need to carry over exact setting names to other devices; use the documentation for your model.
Keeping your home number does not guarantee delivery of bank codes or free roaming. Receiving messages may depend on the device, the line’s status and the operator’s terms.
Check the start of the tourist plan separately: purchase, profile installation and activation may be governed by different terms. Once your connection is set up, prepare apps for a trip to Thailand.
Plan validity, top-ups and the 60-day rule
Do not mix up the validity of an internet plan, the balance and the period of use of a tourist SIM. Money in your account alone does not confirm that the plan or number is still active.
Thailand’s telecom regulator (NBTC) specifies a period for tourist SIMs of no more than 60 days with no option to extend use by topping up. However, the validity of each specific offer should be checked separately.
The operators (True-dtac) state on the SIM packaging a validity of no more than 60 days; after it ends, top-ups do not extend it. Details are given in the official terms for tourist SIMs (True-dtac).
Separately, AIS notes that foreign tourists, to continue using a tourist SIM after 60 days from the activation date need to re-verify their identity. This should not be read as a promise of automatic renewal for every tourist number.
If you choose a tourist SIM in Thailand for a long stay, find out the operator’s ongoing service procedure in advance. Ask what steps will be required after the plan and the SIM’s validity end, rather than relying only on top-ups.
What to check if the internet does not work
Check the connection step by step to find where the problem occurred. Start with the status of the line and the plan, then move on to the settings.
- Make sure the physical SIM is installed or the eSIM profile has been added.
- Check whether registration is complete.
- Make sure the correct line is selected for data.
- Check whether the plan is active.
- Confirm there is coverage at your current location.
- Compare the settings with the provider’s instructions.
Change roaming and access point name (APN) settings only according to the instructions from the provider of that specific SIM. Settings from another product may not suit your connection.
If the problem persists, contact the seller or operator and list the checks you have already done. Without diagnosis, no single action can be promised to restore the internet.
Frequently Asked Questions ❓
How does a local eSIM differ from an international travel eSIM (travel-eSIM)?
These are offers from different providers, which should be compared by network, services and service terms. The electronic format itself does not determine whether you get a Thai number, calls or messages.
Do you need a Thai number if internet and messaging apps are enough?
Choose based on your needs: if you do not need regular calls and text messages to a local number, focus mainly on the internet plan. Still check separately whether a number is included and what services it contains.
Can you make calls with a data-only tourist SIM?
It depends on the product. For the tourist SIM category described by the operators (True-dtac) as “internet only” (Data-Only), internet and receiving calls and messages are available, while outgoing calls are limited to support and emergency services.
Can you install an eSIM before departure, and when does the plan's validity start?
Check whether pre-installation is possible and when the countdown starts separately with the provider. Do not treat profile installation and the start of the plan as the same event unless the terms confirm it.
Can you tether internet to a laptop from an unlimited plan?
Only if the chosen plan allows it. Check the hotspot limits: unlimited internet on a phone does not confirm unlimited tethering.
Will you still receive messages on your home SIM?
It may depend on whether the device supports two lines, the status of the home line and its operator’s terms. Delivery of a specific message, including a bank code, cannot be guaranteed in advance.
Does topping up extend the validity of a tourist number?
You should not count on this happening automatically. The terms of the operators (True-dtac) rule out extending a tourist SIM by topping up after the period ends, while AIS separately describes re-verifying identity to keep using it after 60 days.
Conclusion
When choosing a tourist SIM in Thailand, compare phone compatibility, the length of your trip, the services you need and coverage along your route. The lowest price does not make an offer suitable on its own: high-speed data, calls, messages and the ability to connect a laptop all matter.
Before paying, open the terms of the chosen plan and check the validity period, high-speed data, calls, tethering and when it starts. If you plan a long stay, also find out the registration and ongoing service procedure.
Prices, promotions and service rules may change. Save your purchase terms, and check other preparations through the first-trip checklist for Thailand — this way connectivity becomes part of your preparation rather than an unresolved question after landing.