Land in Thailand and you'll want data in your pocket — to book a Grab, run Google Maps, and check a place on the fly. Picture standing outside Suvarnabhumi at 2am, unable to open the Grab app. We compare all three options in full — price, pros, cons — plus a step-by-step on setting up an eSIM before you fly.
Straight up: data is as essential to a Thailand trip as your passport. Picture standing outside the terminal trying to call a ride but the Grab app won't load, hungry and unable to find the restaurant down the soi, or wanting to check what time a temple closes — every one of those needs the internet, whether it's Grab to call a car, Google Maps for navigation, or LINE to message your guesthouse, right down to scanning a PromptPay QR code to pay. Thailand has 4G/5G coverage across nearly every area tourists visit; you just need to pick the right way to connect.
Travellers have three main options — an eSIM (a digital SIM you install before you fly), a tourist SIM you pick up at the airport counters (AIS, dtac, TrueMove), and Pocket WiFi (a portable hotspot device). This page lays out exactly what each one costs, the pros and cons, who it suits best, then walks you through setting up an eSIM step by step until it's working for real.
Scroll the table sideways to see every column — prices are rough ranges for a trip of about 7–10 days (based on popular 2026 providers). Each provider prices differently by data amount and number of days, so check the latest before you buy.
| Option | Rough price | Pros | Cons | Best for |
|---|---|---|---|---|
| eSIMDigital SIM | ~฿300–600 (8GB–unlimited / 7–10 days) | Install before you fly, no airport queue, nothing to return, cheapest per head | Phone must support eSIM + be unlocked · usually no phone number | Solo/couple travellers with newer phones |
| Tourist SIMAirport counter | ~฿300–600 (tourist SIM, 8–15 days) | A real SIM, usually with a phone number and a big data bundle, sold at the AIS/dtac/TrueMove counters | Queue at the airport · remove and store your home SIM · easy to lose | Travellers who want a number or a physical SIM |
| Pocket WiFiPortable router | ~฿1,300–2,500 (rented for the whole 7–10 day trip) | Connects several devices at once, shared by the whole group, works with any phone | Carry it and charge it daily · pick up and return the unit · deposit required | Groups of friends or families |
It sounds technical, but it really only takes a few minutes. Follow these six steps while you're still at home (and still on WiFi), and you'll have data the second you step off the plane in Thailand — no queueing for a SIM at the airport.
Every iPhone from the XR/XS (2018) supports it · on Android, phones like the Samsung Galaxy S20+ and Pixel 4+ do too. The quick check: dial *#06# — if there's a 32-digit EID, you're good. The phone also has to be carrier-unlocked.
Pick an eSIM provider and buy a Thailand package for the number of days and the amount of data you want. Pay online before you even fly. Prices start in the low hundreds of baht — choose a daily 1–2GB plan or go unlimited.
After paying you'll get a QR code by email. Open it on another screen and scan it with your phone's camera (or enter the code by hand) and your phone adds the eSIM profile — doing this while still on home WiFi is smoothest.
Go to Settings → Cellular/Mobile Data and turn on data roaming for the eSIM only (not your home SIM, to avoid pricey roaming). Some providers want you to set an APN as the email describes — just follow it line by line.
Most packages start counting the days from your first connection to a Thai network, not when you scan the QR. When you land and switch your phone on, pick a Thai network (AIS/dtac/TrueMove) and data springs to life on its own.
Leave your home SIM's data roaming off the whole time so you never get hit with steep charges, but you can keep receiving calls on it (calls/SMS still come in) while you use data from the eSIM — both SIMs work at once.
The most-asked question is "how many GB should I buy?" — and the answer depends on how you use your phone. Read these three tiers and you can size yourself up right away.
If you mostly just book a Grab, navigate with Google Maps, and chat on LINE with a bit of social scrolling, around 1GB a day is more than enough. A 7-day trip is comfortable on a 7–10GB package, and you'll save a fair bit.
If you love to watch clips, stream music, video-call, or post photos and videos to IG/TikTok often, allow 2–3GB a day — or just go for an unlimited package and stop worrying about running out.
Most unlimited packages give full speed for the first 1–2GB each day and then throttle the speed (still fine for chat and maps, but clips won't play smoothly). If you want full speed all day, look for a package that says "no speed throttling" — which costs more.
Tuck these away and your trip won't have a dead-signal moment when you need data most — especially while you're waiting on a Grab or navigating on the move.
The 4G/5G networks of AIS/dtac/TrueMove reach nearly every area tourists visit — Bangkok, Chiang Mai, Phuket, Krabi, Samui. Both eSIMs and Pocket WiFi run on these same networks, though signal can thin out on remote islands or up in the hills.
It comes down to how many of you are travelling, what phone you carry, and whether you want a phone number — read these four cases and the choice makes itself.
Where to land, how to get around the city, which area to stay, what to eat — everything before your first run at Bangkok.
Bangkok Guide →How to ride the Skytrain and metro, which ticket to buy, where lines connect — open the app and navigate once you're online.
BTS/MRT Guide →The old city, Doi Suthep, ethical elephant visits, northern food — plan your first run at Chiang Mai in full.
Chiang Mai Guide →Which beaches are worth it, which islands to reach, the day trips that pay off — open the Phuket guide before you head south.
Phuket Attractions →Estimate accommodation, food, and transport per day — data included — and get a number before you plan the trip.
Trip Budget →Every region and city, with links into city guides, hotels, and attractions across Thailand.
Thailand Guide →Set up an eSIM or line up a tourist SIM while you're still at home, then open the first-timer guide — where to land, where to stay, how to get around, everything before you fly — and book a well-placed hotel ahead of time.