Yes. Thailand has solid 4G coverage across Bangkok, Chiang Mai, Phuket, and most tourist corridors. Kolet partners with two of the country's biggest carriers: AIS and DTAC, both offering LTE/4G and 5G where available. You scan a QR code before you leave home, land in Suvarnabhumi, and your phone connects automatically. No SIM tray. No airport queue.

Your original SIM stays in your phone the entire time. You keep your home number for calls and messages while the eSIM handles all your data abroad.

Here is the short compatibility list:

• iPhone XS or newer (2018 and up)
• Samsung Galaxy S20 or newer
• Google Pixel 3 or newer
• Most flagship Android devices from 2019 onwards

One condition matters more than the device model: your phone must be carrier-unlocked. If you bought it directly from a carrier on a contract, check with them first. If you bought it SIM-free or have finished your contract, you are almost certainly good to go.

Not sure? Kolet's compatibility checker on the plan page takes about ten seconds.

This is the question that stresses people out the most. It shouldn't.

Kolet offers two plan types for Thailand. Fixed data plans (1 GB to 20 GB, valid 30 days from first use) suit travellers who know roughly how they browse. Unlimited day-based plans let you pay per travel day instead of calculating gigabytes.

For a 10-day trip, most travellers land somewhere between 5 GB and 10 GB. Light users relying on hotel Wi-Fi for streaming can manage on 3 GB. Heavy navigators, remote workers, or anyone skipping hotel Wi-Fi entirely will feel comfortable at 10 GB.

Here is what eliminates the anxiety: unused fixed plan data converts to Koins at expiry. 1 euro spent equals 100 Koins. Buy 10 GB, use 6 GB, and the remaining value comes back to your wallet automatically. Over-buying is no longer a waste.

Full speed, until the last megabyte. On Kolet's fixed plans, there is no throttling, no fair-use cap, and no speed reduction as you approach your limit. You get 4G/LTE through AIS and DTAC for the entire plan.

On unlimited day-based plans, you get full speed up to 5 GB per 24-hour window, then the connection drops to 1 Mbps until the window resets. That is enough for maps, messaging, and email. Kolet publishes this clearly. Most competitors apply similar caps but bury the detail in the fine print. Kolet does not.

Yes, and this is genuinely unusual. Kolet's unlimited day-based plans earn 10 Flying Blue miles per euro spent. You can also pay with miles you have already accumulated. Refer a friend and you earn 250 miles; they get a free plan. No other major travel eSIM, including Airalo, Holafly, or Saily, is integrated with Flying Blue.

Kolet became B Corp certified in January 2026, scoring 99.7 out of 200. That score puts it among the top performers in the category. It is the only major travel eSIM with this certification. Holafly, Airalo, and Saily are not B Corp certified.

Practically, it means no plastic SIM card is produced for your trip, and the company is independently audited on environmental and social criteria. For travellers who care about where their money goes, that matters.

Do I need to remove my SIM card? No. The eSIM runs alongside your physical SIM.

When does data start? Only when you use the first megabyte. Not from purchase, not from installation.

Can I top up mid-trip? Yes, on fixed plans. Unlimited day-based plans do not support mid-trip top-ups.

Can I share data via hotspot? Fixed plans support hotspot sharing. Unlimited plans do not.

What does a Thailand eSIM cost? From €3.99 for 1 GB up to €15.99 for 20 GB (valid 30 days). At €10.99 for 10 GB, it undercuts most airport SIM options significantly.

How do I install it? Scan a QR code on Wi-Fi before you travel. Takes under two minutes.

Does it work in Phuket and Koh Samui? Yes. AIS and DTAC cover the major islands and resort areas.

Can I use it across multiple countries on one trip? One Kolet eSIM covers 190 countries. Only the plan changes per destination.

What if I run out of data? Top up directly in the app. No reinstallation needed.

Is there customer support? Yes, available in the app.