Thailand SIM Card and eSIM Guide: Where to Buy, Prices, and Tourist Tips

If you are traveling to Thailand in 2026, compare an official local tourist SIM or eSIM with your home carrier's roaming offer. The best choice depends on trip length, whether your phone supports eSIM, and whether you need a Thai phone number or included call credit.

TL;DR: For a short trip, compare the official tourist SIM and eSIM plans from AIS and True-dtac, including dtac-branded plans. If your unlocked phone supports eSIM, buy from an official operator page and follow its activation timing. If you need help or a physical SIM, use an airport or city operator store and bring your original passport for mandatory registration. Prices below were rechecked on July 17, 2026 and can change.

Direct Answer: Which Thailand SIM Should You Buy?

1. Thailand Tourist SIM Prices Rechecked in July 2026

The official tourist-plan pages reviewed here are from AIS and True-dtac, including dtac-branded plans. Check each operator's current coverage map for the exact places on your itinerary; reception varies by location and device.

AIS Lucky Tourist SIM

AIS listed these tourist plans when rechecked on July 17, 2026:

• 1 day: 49 THB, 1GB data at 10 Mbps
• 5 days: 399 THB
• 8 days: 499 THB
• 15 days: 699 THB
• 30 days: 1,199 THB
• 60 days: 1,599 THB

AIS markets these as 5G/4G tourist plans. Its official page says the SIM must be registered before use; foreign tourists who continue using a tourist SIM beyond 60 days from activation must reconfirm their identity.

dtac Happy Tourist eSIM

The dtac tourist page listed:

• Happy Tourist 299 eSIM: 8 days, 15GB at max speed, 15 THB free call credit
• Happy Tourist 599 eSIM: 15 days, 30GB at max speed, 15 THB free call credit

Compare these fixed max-speed allowances with the unlimited-data terms on other official tourist plans before choosing.

True-dtac Tourist Infinite SIM

True-dtac's tourist page FAQ highlights Happy Tourist Infinite SIM 8 days at 449 THB for 5-7 day trips. The same page warns that extra data after the package period may be charged separately, so check validity and renewal conditions before using data after the included package ends.

2. eSIM vs Physical SIM: Which Is Better?

Choose eSIM if:

• Your phone supports eSIM and is unlocked.
• You want internet immediately after landing.
• You do not want to queue at an airport counter.
• You prefer a digital SIM and have checked whether the selected plan includes the Thai number or call credit you need.

Choose a physical SIM if:

• Your phone does not support eSIM.
• You want staff to install and test it for you.
• You need a Thai number and call credit explained clearly.
• You are staying longer and may need help topping up or changing packages.

Thai prepaid SIMs must be registered to the user. Foreign tourists should bring their original passport, SIM, and SIM package when registering at an operator service center or authorized retailer. Do not accept a SIM that remains registered to someone else.

3. Official Purchase Channels

Airport counters

AIS and dtac publish tourist-SIM locations at Bangkok Suvarnabhumi (BKK), Don Mueang (DMK), Phuket (HKT), and Chiang Mai (CNX) airports. At an official counter, ask staff to complete passport registration and confirm that the SIM and data connection work before you leave.

7-Eleven and convenience stores

dtac says Happy Tourist SIMs are available through online channels, major airports, and convenience stores throughout Thailand. True-dtac also publishes terms for 49 THB and 199 THB dtac 7-Eleven SIMs, but that page states a promotion period ending June 30, 2026, or until otherwise changed by the company. Treat those figures as expired-period terms unless the operator or store confirms that they still apply.

The tradeoff is consistency. A convenience-store branch may carry a regular prepaid SIM instead of the exact tourist SIM you saw online, and staff support for eSIM setup or English explanations can vary. Bring your passport, ask whether the SIM can be registered and activated on the spot, and check whether the package renews automatically after the first validity period.

Official online channel or operator store

If you are comfortable setting up mobile data yourself, use the official operator website/app or a city store. Confirm the package name, validity, max-speed allowance, renewal rule, and registration status before paying.

4. Common Mistakes to Avoid

1. Buying more days than you need. A 30-day package is unnecessary for a one-week Bangkok and Phuket trip.
2. Ignoring max-speed data. Some plans say unlimited, but only a fixed allowance is at max speed.
3. Forgetting passport registration. Keep your passport ready at the counter.
4. Using data after package expiry. True-dtac notes extra data can be charged after the package data period ends.
5. Assuming every 7-Eleven sells the same package. Convenience stores are useful, but branch stock and package names can differ from airport tourist counters or online eSIM pages.
6. Ignoring the eSIM activation instructions. Check the operator's instructions before scanning the QR code or enabling the line.
7. Assuming coverage is identical everywhere. Check the operator's current coverage map for the places on your itinerary.

5. Quick Recommendation

For most travelers:

• Budget 8-day trip: dtac Happy Tourist 299 eSIM if your phone supports eSIM.
• Simple airport setup: AIS 8-day or 15-day Tourist SIM at an official counter.
• Already in Thailand: Check a nearby 7-Eleven or convenience store, but confirm the package name, passport registration, and auto-renewal terms before paying.
• Two-week trip: Compare AIS 15-day and dtac 599 eSIM by current price and data allowance.
• One month or longer: Use AIS 30-day / 60-day tourist plans or ask an official store about regular prepaid packages.

Before you pay, open the official operator page and compare the current package name, validity, max-speed data, call credit, and renewal terms.

References

Prices and plan names can change. Verify current details on official operator pages before purchase:

• AIS SIM & Plans for Tourist
• True-dtac Tourist SIM and eSIM
• dtac Happy Tourist SIM
• dtac Where to Buy Happy Tourist SIM
• dtac 7-Eleven SIM Card terms
• AIS tourist SIM shop locations
• dtac tourist SIM registration instructions
• NBTC 2025 tourist-SIM registration and 60-day-use measures