Best SIM Card in Thailand (2026 Guide)

Best SIM card Thailand 2026: Thailand has excellent, affordable mobile data and getting connected is straightforward. For most tourists, the choice comes down to three options: an AIS tourist SIM, a True Move H tourist SIM, or a pre-installed eSIM sorted before you fly. Physical SIM cards cost ฿299–฿1,199 (~£7–£28) depending on plan length and where you buy. An eSIM from a provider like KKday can be installed at home, arrives cheaper than airport kiosks, and means your phone is live the moment you land.

AIS, True Move H or eSIM? Quick Comparison

Prices verified August 2026. THB conversions approximate at current rates. Airport prices are 30–50% higher than in-city stores for the same plan.

The Three Main Networks in Thailand

AIS — Best Coverage on Islands and Remote Areas

AIS is Thailand’s largest mobile operator and consistently rated best for nationwide coverage — particularly on islands, in northern mountain provinces, and in areas away from the main cities. If your trip includes Koh Lipe, Koh Tao, Koh Chang, remote parts of Chiang Rai, or anywhere off the main tourist circuit, AIS is the most reliable choice.

Tourist SIM plans (2026):

• 8 days unlimited data: ฿299 (~£7)
• 15 days unlimited data: ฿399 (~£9)
• 30 days unlimited data (7-Eleven): ฿599 (~£14)
• 30 days unlimited data (airport): ฿1,199 (~£28)

AIS tourist SIMs are available at Suvarnabhumi (BKK), Don Mueang (DMK), Phuket, Chiang Mai and Koh Samui airports, plus 7-Eleven and Family Mart convenience stores and official AIS shops. You’ll need your passport at point of sale for registration.

True Move H (formerly dtac) — Best for Cities and Social Media

True Move H is now the second largest network in Thailand following the 2023 merger between True Corporation and dtac. Both brands continue to operate under their own names but run on the same combined network infrastructure. In practice, a True Move H SIM and a dtac SIM give you access to the same towers.

True Move H performs excellently in Bangkok, Chiang Mai, Pattaya, Phuket and other major tourist cities. Many of their tourist packages include unlimited social media usage (Facebook, Instagram, Line) that doesn’t count against your main data allowance — a genuine advantage for heavy social users.

Tourist SIM plans (2026):

• 7 days: ฿299 (~£7)
• 15 days: ฿499 (~£12)
• 30 days: from ฿599 (~£14) in-store

Available at airports, 7-Eleven, and True/dtac branded stores throughout Thailand.

Which Network Should You Choose?

• Island hopping or trekking remote areas: AIS
• Bangkok and city-focused trip: True Move H or dtac — similar quality, often better value
• Heavy social media use: True Move H for unlimited social add-ons
• Want to decide in advance without queuing: eSIM (see below)

Best eSIM Providers for Thailand — Compared

For eSIM-compatible phones, the three main providers for Thailand are Airalo, Holafly and Nomad. They all use Thai networks (AIS or True Move H) and all install digitally before you fly. The differences come down to pricing structure and data limits.

Our pick: Airalo — the most established platform, widest plan choice and competitive pricing. A 5GB/7-day plan covers a typical Thailand holiday for around £5.50. Browse Airalo Thailand plans →

For a full breakdown of every plan with pricing: Airalo vs Holafly vs Nomad — full eSIM comparison →

Physical SIM vs eSIM — Which Is Right for You?

If your phone supports eSIM (most phones made after 2019 do), an eSIM bought before you travel is the most convenient option. You install it at home, set it to activate on arrival, and walk out of baggage claim already online. No queue at the airport counter, no waiting, no fumbling with a SIM tray on a busy arrivals concourse.

One practical advantage of eSIM that often gets overlooked: you can keep your home SIM active for calls and bank authentication (OTP codes) while using the Thai eSIM for data. Particularly useful for UK visitors whose bank sends SMS verification codes.

Where to Buy a Thailand SIM Card

Before You Fly — eSIM Online

The most efficient option for eSIM-compatible phones. KKday’s Thailand SIM and eSIM page lets you compare plans, choose your coverage period, and have everything ready to activate on landing. No queues, no language barrier, no hunting for a counter at midnight arrivals.

At the Airport

All major Thai airports have official SIM counters from AIS, True Move H and dtac in the arrivals hall after customs and immigration. Suvarnabhumi (BKK), Don Mueang (DMK), Phuket, Chiang Mai and Koh Samui are all covered. Convenient but typically 30–50% more expensive than buying in-city. At ฿1,199 for 30 days unlimited versus ฿599 at 7-Eleven, the airport premium is real — if you can wait 20 minutes until your first convenience store stop, it’s worth the saving.

7-Eleven and Convenience Stores

The best value for physical SIMs. Every 7-Eleven in Thailand stocks AIS and dtac tourist SIMs — plans starting from ฿299 for 8 days. Staff can help activate them. You need your passport. There are over 13,000 7-Eleven stores in Thailand, so you won’t have to look far.

Official Carrier Stores

AIS, True Move H and dtac shops are in every major shopping mall, airport, and city centre. Best if you want advice on a specific plan or need help with setup. Also useful for local (non-tourist) SIMs which are significantly cheaper for stays over 30 days.

Do You Need Your Passport?

Yes — all SIM card purchases in Thailand require passport registration under Thai law. This applies to airport counters, 7-Eleven and official stores. Keep your passport accessible when arriving. For eSIMs bought online in advance, registration is typically completed digitally during checkout.

How Much Mobile Data Do You Need?

• Short holiday (7–14 days): A 7–15 day unlimited plan from any major carrier. The ฿299–฿399 tourist SIMs are more than enough.
• Three weeks or more: 30-day unlimited SIM at ฿599 in-store, or an eSIM plan bought in advance. Worth comparing KKday’s 30-day options against local carrier pricing.
• Digital nomads / DTV visa holders: Consider a local prepaid SIM (non-tourist) from a carrier store — plans start from ฿49 and ongoing costs are 50–70% cheaper than tourist packages. If you’re staying on a DTV, local plans make far more sense after the first month.

For digital nomads planning an extended Thailand stay, our DTV Visa Changes guide and guide to opening a Thai bank account are worth reading alongside this.

Mobile Coverage in Thailand

All three networks offer 5G in major cities and tourist areas — Bangkok, Chiang Mai, Phuket, Pattaya, Koh Samui and most tourist routes are well served. In practice, the difference between AIS, True and dtac is minimal in these locations. 5G coverage thins out in rural areas and smaller islands, where AIS tends to maintain better signal.

You can check live coverage maps on each carrier’s official website before choosing: AIS, True Move H.

Tips Before You Buy

• Check eSIM compatibility first. Settings → About → check for an “Add eSIM” option. Most phones from 2019 onwards support it — some budget Android models do not.
• Don’t buy at the airport unless you have to. You’ll pay up to double. A 7-Eleven is usually within 10 minutes of any airport exit.
• Use Grab from day one. The app works immediately on any data connection and is essential for getting around. Having data before your first Grab ride removes a lot of stress on arrival.
• Take a screenshot of your APN settings if buying a physical SIM at a shop — sometimes they don’t configure data automatically on unlocked phones.
• Local SIMs for stays over 30 days. Tourist SIM pricing doesn’t scale well beyond a month. A local prepaid SIM from a carrier store works out 50–70% cheaper for longer stays.

Frequently Asked Questions

What is the best SIM card in Thailand?
>>>>For island and rural travel: AIS. City travel and social media: True Move H or dtac (same network since 2023). For convenience with an eSIM-compatible phone: buy an eSIM before you fly through KKday.

How much does a SIM card cost in Thailand?
Physical tourist SIMs: ฿299–฿599 (~£7–£14) at 7-Eleven, ฿1,199 (~£28) at airports. eSIMs bought online typically cost $8–$14 (~฿270–฿480) for 7–30 days.

Is dtac still available in Thailand?
Yes, the dtac brand continues to operate but it merged with True Corporation in 2023 and now runs on the True Move H network. You will still see dtac-branded SIMs and counters at airports and stores — they perform identically to True Move H.

Can I use an eSIM in Thailand?
Yes — if your phone supports eSIM (most phones from 2019 onwards), it is by far the most convenient option. You install before flying, the eSIM activates on landing, and you keep your home SIM active for calls and bank SMS. Buy via KKday’s Thailand SIM and eSIM page.

Do I need a passport to buy a SIM in Thailand?
Yes — Thai law requires passport registration for all SIM purchases. Have it accessible at the point of sale. For eSIMs bought online, registration is done digitally during checkout.

Where can I buy a SIM card in Thailand?
Airport counters (most expensive), 7-Eleven stores (best value), official carrier stores (best advice), or online as an eSIM before you travel. The airport option costs 30–50% more than 7-Eleven for the same plan.