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Thailand runs on smartphones. You will use data to book Grab rides, scan QR menus, find street-food stalls on Google Maps and check ferry times to the islands. The easiest way to get connected is a travel eSIM that you install before you leave home.
Below we compare the eSIMs that work best in Thailand, set them against the tourist SIMs sold at Bangkok airport and suggest how much data to buy.
Quick answer: the best eSIM for Thailand
| Provider | Best for | Why we like it |
|---|---|---|
| Airalo | Most travellers | Simple app, Thailand and Asia regional plans, quick top-ups |
| Yesim | Long trips and digital nomads | Pay-as-you-go and unlimited-style options for weeks or months in Thailand |
| Saily | Heavy public Wi-Fi users | Security features from the makers of NordVPN |
If you are also visiting Vietnam, Cambodia, Malaysia or Bali, look at regional Asia plans instead of a Thailand-only plan. You install once and stay connected across borders.
Mobile networks in Thailand
Thailand has two main mobile groups: AIS and True (TrueMove H, which merged with dtac). Both have fast 4G and wide 5G coverage in Bangkok, Chiang Mai, Phuket, Krabi and Koh Samui. Coverage on the popular islands is generally good, though some small or remote islands can be patchy.
eSIM vs tourist SIM at the airport
At Suvarnabhumi and Don Mueang airports you will find operator counters selling tourist SIM packs. They work well, but you need to queue and show your passport, and the counters get busy when several long-haul flights land at once.
- An eSIM gets you online the moment you land. You keep your home number and top up in the app.
- A tourist SIM gives you a Thai number, which some local services ask for, but you queue on arrival and have to swap out your home SIM.
If you need a Thai phone number for a long stay, a local SIM makes sense. For a holiday of up to a month, an eSIM is the more convenient choice.
Which eSIM should you choose?
Airalo
Airalo offers Thailand plans plus Asia-wide packages. It is a safe pick for first-timers because the app walks you through installation step by step.
Yesim
Yesim suits longer stays. If you are spending a month working from Chiang Mai or island-hopping slowly, its flexible plans can work out better than buying several small packs.
Saily
Saily adds privacy and security tools on top of data. That helps if you spend a lot of time on hostel and café Wi-Fi.
How to install and activate your eSIM
- Check your phone first. Your phone must support eSIM and be carrier-unlocked. On iPhone go to Settings → General → About and look for “Digital SIM”; on Android search Settings for “eSIM”.
- Install before you fly, on hotel or home Wi-Fi. Scanning the QR code needs an internet connection, and most plans only start counting days when they first connect to a local network.
- Keep your home SIM on for calls and texts (useful for bank codes), but turn off data roaming on it so you are not charged by your home operator.
- Set the eSIM as your mobile data line and switch on data roaming for the eSIM only. Travel eSIMs connect as a roaming partner, so this is expected.
- Delete nothing until you are home. If you remove an eSIM profile you usually cannot reinstall it.
How much data do you need?
| Trip style | Typical use | Suggested plan |
|---|---|---|
| Light | Maps, WhatsApp, booking emails | 1 GB per 3–4 days |
| Normal | Plus Instagram, ride apps, some video calls | About 1 GB per day, or a 10–20 GB plan |
| Heavy / remote work | Hotspot for a laptop, video, uploads | Unlimited, or 20 GB+ with top-ups |
Tip: switch off automatic app updates and photo backups over mobile data. They are the most common reason travellers run out of data on day two.
Plan the rest of your Thailand trip
Compare fares in our guides to cheap flights from London to Bangkok and from Paris to Bangkok.
FAQ
Does Grab work with an eSIM?
Yes. Grab, Bolt and food-delivery apps work over eSIM data. Some services send an SMS code, so keep your home SIM active for texts.
Is 5G available on travel eSIMs in Thailand?
Many plans include 5G where your phone and the partner network support it. Check the plan details before buying.
Can I use my eSIM as a hotspot?
Most plans allow tethering, but check the plan page first, especially for unlimited plans, which sometimes limit hotspot use.