Best Unlimited Data eSIM for Thailand

By Best:in Editorial Team · Updated September 2026

As of September 2026, no Thailand eSIM offers truly limitless data: most "unlimited" plans cap high-speed use between 2GB and 5GB per day before throttling. AIS Tourist eSIM and True-dtac Tourist eSIM, run by Thailand's own carriers, give the broadest coverage, while Saily offers the largest daily high-speed allowance among resellers and Nomad has the cheapest unlimited entry price.

Best Unlimited Data eSIM for Thailand, ranked

1.

AIS Tourist eSIM

AIS Tourist eSIM is issued directly by AIS, the carrier with the widest overall coverage in Thailand including islands and northern mountain regions. It offers four plans from 5 to 30 days validity with unlimited data and unlimited AIS-to-AIS calls, though independent reviews report a roughly 2.5GB-per-day full-speed fair-use cap before throttling.

Best for: Best overall network coverage

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2.

True-dtac Tourist eSIM

True-dtac Tourist eSIM's own terms describe unlimited internet at maximum available speed with no stated numeric daily cap, running on the combined True and dtac network that reaches over 99% of Thailand's population since their 2023 merger. Three plans cost 449 to 1199 Baht (about $13.85-$36.95) for 8, 15, or 30 days.

Best for: Best genuine unlimited speed claim

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3.

Holafly Thailand eSIM

Holafly sells its Thailand eSIM by the day, from 1 to 90 days at $1.55 to $3.90 per day, and markets it as unlimited without publishing a daily high-speed cap. It bundles 24/7 support, though coverage can weaken in remote spots like the Similan Islands, and a 30-day plan runs about $73.90 per third-party comparisons.

Best for: Best for flexible per-day pricing

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4.

Saily Thailand eSIM

Saily's unlimited Thailand plan includes 5GB of high-speed data per day with no slowdown after, the largest disclosed daily allowance among the reseller eSIMs here. Prices for unlimited tiers range from $17.09 to $64.79 depending on the 7, 15, or 30-day validity chosen, and purchases stay valid to activate for 180 days.

Best for: Best daily high-speed data allowance

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5.

Nomad Thailand eSIM

Nomad's unlimited Thailand eSIM starts at just $16 for 10 days, the cheapest unlimited entry price in this list, rising to $33 for 30 days. Its unlimited plans cap high-speed data at 2GB per day before throttling to 1000kbps, and all Thailand plans are data-only with no local phone number.

Best for: Cheapest unlimited entry price

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6.

Airalo Thailand eSIM

Airalo's unlimited Thailand plans cap high-speed data at 3GB per day before throttling to 1000kbps, and a 10-day unlimited plan costs around $34.99, among the pricier options once throttling is accounted for. Airalo connects through the AIS network and is best suited to travelers who also want its global or Asia regional eSIMs on the same trip.

Best for: Best for multi-country travelers

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What does "unlimited data" actually mean on a Thailand eSIM?

Every eSIM in this guide advertises "unlimited data," but the fine print varies a lot. Reseller brands such as Airalo, Nomad, and Saily attach a fair-use policy (FUP) to their unlimited plans: once a daily high-speed threshold is hit, the connection is throttled rather than cut off. Airalo's unlimited plans allow 3GB of high-speed data per day before dropping to 1000kbps, while Nomad throttles at 2GB per day to the same speed.

Saily is more generous, offering 5GB of high-speed data per day with no slowdown after that point. AIS Tourist eSIM, sold directly by Thailand's largest carrier, is reported to apply a roughly 2.5GB-per-day full-speed cap before throttling until the next day. True-dtac Tourist eSIM is the only plan in this set whose own terms describe unlimited internet "at maximum available speed" without stating a numeric daily cap.

How much does an unlimited data eSIM for Thailand cost?

Price depends heavily on trip length and provider. For a 10-day unlimited plan, Nomad is the cheapest at $16, followed by Saily's unlimited tier which starts around $17.09 for shorter validities and rises to $64.79 for longer ones. Airalo's 10-day unlimited plan runs about $34.99, and Holafly's per-day pricing of $1.55 to $3.90 works out to roughly $36.50 to $36.90 for the same 10 days.

True-dtac Tourist eSIM prices its three tourist plans at 449 to 1199 Baht (about $13.85 to $36.95) for 8, 15, or 30-day validities. AIS keeps a very low entry point too, with a 1-day, 1GB budget SIM for about 49 Baht (roughly $1.50), alongside four unlimited-data tourist eSIM options spanning 5 to 30 days.

Which mobile network should I pick for coverage across Thailand?

Network choice affects how well an eSIM performs outside Bangkok and Phuket. AIS provides the widest overall coverage in Thailand, including rural areas, islands, and northern mountain regions, which is why Nomad and Airalo both route at least part of their Thailand traffic through the AIS network. True-dtac Tourist eSIM runs on the combined True and dtac infrastructure created by their 2023 merger, which now reaches more than 99% of Thailand's population.

Nomad's unlimited plans specifically connect through True Move H rather than AIS or dtac. Holafly does not publish which local network it resells, but notes that coverage can be less reliable in remote spots such as Khao Sok National Park, the Similan Islands, and Tarutao National Marine Park.

How do I install and activate an unlimited data eSIM in Thailand?

  1. Buy online before departure

    After buying online, the provider emails a QR code and setup instructions. On the phone, the traveler opens Settings, adds a new cellular or mobile data plan, and scans the QR code (or taps an install link on the same device used to buy the plan).

  2. Install and set as the data line

    Once installed, the eSIM should be labeled and set as the data line, while the traveler's home SIM can stay active in a second slot for calls and SMS if the phone supports dual SIM. Most resold eSIMs, including Airalo, Nomad, Saily, and Holafly, activate automatically the moment the device connects to a Thai network, so it is safe to install before departure and only enable data after landing.

What should I check before buying an unlimited eSIM plan?

Buyers should check four things before choosing an "unlimited" Thailand eSIM: the daily high-speed data cap (2GB for Nomad, 3GB for Airalo, 5GB for Saily), whether a local phone number is included, the hotspot or tethering allowance, and the plan's validity window. Nomad's Thailand plans, for example, are data-only with no phone number, so calls have to go through apps like WhatsApp or Line.

Validity also matters for refund and top-up rules. Saily gives purchased eSIMs a 180-day activation window before they expire unused, while True's Tourist SIMs cannot exceed 60 days of validity under the operator's own terms.

Should I choose a Thai carrier eSIM or a reseller eSIM?

Carrier-direct options and reseller eSIMs solve different problems. AIS Tourist eSIM and True-dtac Tourist eSIM are issued by Thailand's own network operators, so pricing is in Thai Baht and support is tied to local shops and call centers. Reseller brands like Airalo, Holafly, Saily, and Nomad sell in US dollars through a single global app, which suits travelers who also want an eSIM for other countries on the same trip.

For a Thailand-only trip focused on maximum daily data, AIS or True-dtac tends to fit best given their carrier-level coverage. For a regional Southeast Asia itinerary, a reseller plan that also covers neighboring countries can save the hassle of switching eSIMs at each border.

How is this ranking computed?

  • Genuine unlimited / fair-use transparency: 30%
  • Price for a 10-day trip: 25%
  • Network coverage across Thailand: 20%
  • Hotspot and local number support: 15%
  • Setup flexibility and support: 10%

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