Thailand SIM Card & eSIM Guide: Prices Compared (2026)

Start with one question: do you need a Thai phone number for local calls, or only dependable mobile data? Choose an AIS, True or dtac tourist SIM when a local number and counter setup matter. Choose an international eSIM when an unlocked compatible phone and data-only service are enough, especially if avoiding an airport queue is the priority.

For a standard short trip, do not buy the largest data headline by default. Hotel Wi-Fi plus maps, messaging and ride-hailing may use only a few gigabytes. Hotspot sharing, long video calls and daily high-resolution uploads are the reasons to consider a much larger or unlimited plan. Compare other destinations in the Asia SIM and eSIM hub.

Current price comparison

Prices below were checked on 20 August 2026. Promotions and exchange rates change, so confirm the final checkout price before paying.

The word “unlimited” needs a close look. Many plans allow unlimited total access but slow the connection after a daily high-speed allowance, which can make maps frustrating to load. Airalo publishes these details at checkout, while dtac describes a separate max-speed allowance. Save a screenshot of the exact terms when buying.

Compare Airalo, Yesim, Saily, Drimsim and GigSky

Airalo offers 1 GB for seven days, followed by 2–20 GB options with longer validity. Its fixed-data 10 GB plan was priced at US$11 on 20 August 2026 and suits a one- or two-week trip built around maps and messaging. The standard Maew product connects via True and another supported network, and its validity begins when it first connects in Thailand. Airalo also lists unlimited plans and a dtac-based package with 50 GB, 100 minutes of calls and a Thai number. That calls-inclusive package follows different activation rules, so do not assume every Airalo eSIM behaves the same way.

Yesim catches the eye with 1 GB for US$3.12, 5 GB for US$8.40, and 10 GB for US$13.20, all generously valid for 30 days. This is a pure data play—there’s no local number here—and the validity clock starts ticking the moment you hit a compatible Thai network. You have a massive 180-day window to activate it after purchase, which is great for planners. One realistic caveat: Yesim notes that hotspot availability depends on the underlying operator. While it’s a brilliant, long-validity backup to keep in your digital pocket, I wouldn’t rely on it as your primary source for tethering a laptop until you’ve confirmed the specific checkout terms.

Saily keeps things competitive with tiered pricing ranging from US$2.99 for a 1 GB/7-day teaser to US$10.99 for a 10 GB workhorse. Its 15-day unlimited plan was priced at US$38.99 on 20 August 2026, offering 5 GB of unrestricted-speed data every day before slowing to 1 Mbps. Standard plans support hotspot sharing and activate when the phone first connects after arrival, provided the roaming settings are ready. The catch is the 30-day activation window: if the trip is delayed, the plan can start counting down before departure, so do not buy it too far in advance.

Drimsim isn’t about bundles; it’s a pay-as-you-go safety net. At roughly €0.01 per MB (about €10 per GB) with no monthly fees or expiry dates, it’s a relief for those who cross borders frequently and just need enough data to book a Grab or check a gate number. However, if you’re staying in Thailand for more than a few days, the costs will quickly eclipse the value of a fixed 5–10 GB bundle.

GigSky offers Thailand plans starting from US$3.99 and a 100 MB free trial for testing the connection. Look beyond the starting price and verify the high-speed allowance and fair-use rules in the app. It appears in this comparison as another available option but is not included in the recommendation cards because a current approved link is unavailable.

Choose by validity and required features rather than by a difference of one or two dollars. If the trip involves calling local hotels or receiving Thai SMS codes, use a local tourist plan or an eSIM that explicitly includes voice service rather than a data-only product.

When a local tourist SIM is better

Buy directly from AIS, True or dtac when staff registration and line testing matter. This is the simpler route for local voice calls or a phone that does not support eSIM. Bring the physical passport because subscriber registration is required at the counter.

AIS currently offers a wide range of tourist packages spanning from five to 60 days. Their shorter plans are particularly attractive, often bundling unlimited max-speed data, free calls within the AIS network, and a local number into a single, affordable price. The dtac tourist page clearly separates the high-speed allowance from the overall service period, which is more useful than the word “unlimited” on its own.

Airport counters are convenient after a long flight, but compare the package rather than accepting the first “Tourist SIM” sign in arrivals. If the queue is long, use airport Wi-Fi to book the ride and visit an operator shop in the city instead. The Suvarnabhumi Airport to Bangkok guide explains the first transfer without relying on mobile data.

Which option fits your trip?

Three to seven days

A modest 1–5 GB travel eSIM is usually enough for a focused city break. Choose a local tourist SIM if you expect to call restaurants or want staff to complete the setup. Download offline maps before boarding so the first journey does not depend on a successful activation.

Eight to fifteen days

Take a moment to compare Airalo’s 10 GB fixed plan against the AIS and dtac packages that align with your travel dates. If your trip involves coordinating with local drivers, making restaurant reservations, or staying in touch with new local friends, having a Thai number becomes significantly more important. On the other hand, if every single booking and ticket is already tucked safely inside your apps, a data-only eSIM is the cleaner, simpler choice.

Islands, the north or remote roads

No reseller can guarantee the same coverage in every part of Thailand. Check which Thai network the eSIM uses, then compare the operator’s coverage map with the stops on the Thailand itinerary. A plan that performs well in central Bangkok may be weaker on a remote northern road or island.

Singapore plus Thailand

A regional eSIM reduces profile switching, but compare its price and validity with two destination plans. On 20 August 2026, Saily’s Asia and Oceania plan covered Thailand and Singapore: 1 GB for 7 days cost US$4.99, 3 GB for 30 days cost US$12.49, and 25 GB for 60 days cost US$48.99. Two country plans may still cost less for short stays. Use the Singapore SIM and eSIM guide to compare the second half of the journey.

Setup without surprise roaming

1. Confirm the phone is carrier-unlocked and supports eSIM.
2. Install the eSIM on reliable Wi-Fi before departure, but follow the provider’s instruction about when to switch it on.
3. Save the QR code, order number and manual APN instructions offline.
4. Set the Thailand line as the mobile-data line.
5. Disable mobile-data switching and data roaming on the home line.
6. Enable roaming only on a travel eSIM when its instructions require it.
7. Test maps and messaging before leaving the airport.

Please, whatever you do, do not delete a failed eSIM immediately in a fit of frustration. Many of these QR codes are strictly single-use, and deleting them often burns your bridge to a refund or a fix. Instead, take a breath, restart your phone, double-check that you’ve selected the correct data line and network settings, and then reach out to the provider’s support team over the airport Wi-Fi.

The practical recommendation

For an unlocked eSIM-compatible phone, compare the 5–10 GB offers from Airalo, Yesim and Saily. Among the offers checked on 20 August 2026, Saily and Airalo had the lowest prices in that group, while Yesim offered 30-day validity and a long activation window. Confirm hotspot and start-date rules at checkout. If the trip requires a Thai number, staff setup or support for an older device, choose a tourist plan from AIS, True or dtac—or the Airalo dtac package when its installation and network terms fit the itinerary.

Include the plan in the Thailand travel budget, check the hotel area in the Bangkok where-to-stay guide, and keep mobile-service marketing separate from the policy checks in the Thailand travel-insurance guide.