Best eSIM for Thailand in 2026: unlimited data, real prices and what to check
Key facts
- VoaSim's Thailand eSIM is truly unlimited — no cap, no throttling, no fair-use fine print.
- Prices are flat per duration: USD 18.90 for 5 days up to USD 61.90 for 30 days, same as every other destination.
- The eSIM roams on Thai networks like AIS, True and Dtac, with strong coverage in Bangkok, Phuket, Chiang Mai and Krabi.
- Your days start at the first connection in Thailand, so install at home and keep the line off until you land.
- A local SIM or a small by-GB plan can beat unlimited if you stay for months or barely leave Wi-Fi.
See the exact price for your dates
Thailand is one of the easiest countries in the world to stay connected in. Coverage in Bangkok, Phuket, Chiang Mai, Krabi and Koh Samui is solid, and an eSIM means you land, switch a line on and you are online before you reach the taxi queue.
The real decision is not whether to use an eSIM, it is which type: a plan sold by gigabytes, or one flat unlimited plan. This page lays out both honestly, with VoaSim's exact prices and the cases where another option is genuinely better for you.
VoaSim prices for Thailand: one price per duration
VoaSim charges the same price for every destination, so a Thailand eSIM costs exactly what a Japan or Europe eSIM costs. There is no per-GB metering, no fair-use clause and no speed cut after a hidden threshold. Prices below already include today's 15% promo.
| Duration | Price | Per day |
|---|---|---|
| 5 days | USD 18.90 | USD 3.78 |
| 7 days | USD 23.90 | USD 3.41 |
| 10 days | USD 30.90 | USD 3.09 |
| 15 days | USD 42.90 | USD 2.86 |
| 30 days | USD 61.90 | USD 2.06 |
| 60 days | USD 106.90 | USD 1.78 |
Trips of 1 to 4 days pay the 5-day package. A second eSIM in the same order gets 10% extra off, which is the cheapest way to cover a travel partner. Maximum is 90 days per eSIM. Check your dates in the price simulator.
Which networks you get in Thailand
A travel eSIM does not build its own towers. It roams on the Thai operators — AIS, True and Dtac — and your phone picks whichever gives the best signal where you stand. You do not choose manually and you do not need to.
What that means in practice:
- Bangkok: dense coverage, 5G available on many networks and compatible phones. We do not promise 5G, but it is common in the capital.
- Phuket, Krabi, Koh Samui, Chiang Mai: strong 4G across town centres, beaches and main roads.
- Island-hopping boat trips: signal drops in open water between islands. That is normal for every carrier and every eSIM brand — download your maps and boarding passes before you leave the pier.
- National parks and remote north: patchy, same as with a local SIM.
VoaSim covers 170 destinations, so the same eSIM keeps working if you add a stop in Vietnam, Cambodia or Japan. See the full destination list.
Unlimited vs. plans sold by gigabytes
Most eSIM brands — Airalo, Nomad, Saily, Ubigi, Yesim, Alosim, Jetpac and others — sell Thailand packages by GB through their app. Some, like Holafly, sell "unlimited" plans with usage conditions written into their terms. Prices and rules change often, so check each one on its own site.
The honest split:
- Pick by-GB if you mostly use hotel and café Wi-Fi, check maps and messages and are fine watching your counter. A small bundle can be very cheap.
- Pick unlimited if you stream on long bus rides, upload videos, use Google Maps all day on a scooter, or travel with someone who burns data. Running out in Krabi at 9pm is the expensive scenario.
VoaSim's promise is narrow and checkable: no cap, no throttling, no fair-use fine print. When you compare, read the terms for caps, validity start and tethering. More side-by-side detail on our comparison page.
Today's prices
Today's promo prices (15% off), the same for every destination. Second eSIM in the same order: 10% extra off. Trips of 1-4 days use the 5-day package.
When a local SIM or carrier roaming is the better pick
We would rather you buy the right thing than the wrong one from us.
A local Thai SIM makes sense if you are staying months, want a Thai phone number for deliveries, bank apps or booking platforms, or your phone does not support eSIM. The trade-off: a shop visit, passport registration, airport queue time and taking your own SIM out, so your home number leaves the phone.
Carrier roaming (T-Mobile international, AT&T International Day Pass, Verizon TravelPass, EE, Vodafone, Three, Telstra, Google Fi and similar) can be fine for very short trips or if your plan already bundles Thailand. It is usually billed per day of use with a daily allowance and reduced speed after it. Rates change by country and plan — open your carrier app and check the current Thailand rate before you decide. Our roaming guide explains what to look at.
A VoaSim eSIM wins when you want a fixed, known cost, your own number intact, and nothing to arrange on arrival.
How to set it up before you fly
Buy, install at home, land connected. The order matters.
- Run the simulator with your Thailand dates and pay by international credit or debit card in USD via Stripe. Invoice comes by email.
- The QR code arrives by email within minutes, with step-by-step instructions for iPhone and Android.
- Install before the flight, on your home Wi-Fi. Then leave the VoaSim line switched off. On Android, do not turn on the eSIM's data before the trip.
- On landing in Bangkok, Phuket or Chiang Mai, switch the eSIM line on and turn off data roaming on your home carrier line.
- Keep your physical SIM active for calls and SMS. WhatsApp stays on your own number.
Your days start counting at the eSIM's first connection to a network in Thailand, not at purchase. If nothing connects, run the free eSIM Rescue check or write to support — if we cannot fix it, you get a 100% refund.
Will your phone work with an eSIM?
Quick check: dial *#06#. If an EID number appears, your phone supports eSIM. As a rule, iPhone XR or newer, Samsung Galaxy S20 or newer, Google Pixel 3 or newer and most phones released from 2020 onwards are compatible.
Two things to confirm before you buy:
- Carrier lock: a phone locked to a home carrier will not accept another eSIM profile. Ask your carrier to unlock it before you travel.
- Hotspot: do not assume it. Tethering depends on the plan — ask our support first if you plan to share data with a laptop or a travel partner.
VoaSim eSIMs are data-only: no Thai phone number and no traditional voice calls. WhatsApp, FaceTime, Google Maps, Grab and Bolt all run over data and work normally. VoaSim does not sell physical SIM cards. See the trust page for company details and support channels.
Why trust VoaSim?
Registered company with an invoice on every purchase, USD payment via Stripe with no hidden fees, human support and a guarantee: if the eSIM will not connect and support cannot fix it, you get 100% back.