If you're planning your trip, one of the first questions you'll have is how to get internet in Thailand as soon as you land: to open Google Maps, let people know you've arrived on WhatsApp, order a Grab, or find somewhere to eat. The good news is that Thailand is one of the best-connected countries in Southeast Asia, with 5G in almost all tourist cities. The bad news is that there are many ways to connect, and they don't all cost or work the same. In this guide, I compare all the options—roaming, Wi-Fi, pocket Wi-Fi, local SIM card, and eSIM—so you can choose wisely and travel without bill shock.
Internet in Thailand: the quick answer
In Thailand, you have five ways to get connected: roaming (the most expensive), hotel Wi-Fi (limited), pocket Wi-Fi (an extra router to carry), local SIM at the airport (cheap but with queues), and eSIM (the most convenient). For most travelers, the eSIM wins for speed and price.
I'll elaborate, but it's good to have the main idea clear from the start. Thailand receives millions of tourists every year, and its mobile infrastructure is prepared for it: there are three major operators (AIS and the True group, which acquired dtac in 2023) with 5G covering over 95% of the population and airport counters designed for travelers. This means staying well-connected is easy and affordable… if you choose wisely. The classic mistake is not deciding anything before leaving, landing with roaming activated, and getting a shock when you see the bill. With any of the local alternatives, you'll pay a fraction of that. The difference between them lies in convenience and price, and that's what the rest of this guide is about: you'll see what each option offers, how much it costs roughly, and in what situations it makes sense. If you're in a hurry, just remember that eSIM is the most practical choice for almost everyone.
Roaming from Spain: convenient but expensive
Roaming means doing nothing: you arrive, turn on your phone, and your Spanish operator connects you via a Thai network. It's the most convenient thing in the world, but Thailand is outside the European Union, so the "roam like at home" rates you enjoy in Europe don't apply. This is where international rates come in, and that's where it hurts.
Depending on your carrier, you have two scenarios. Without a contracted bundle, each megabyte can cost you several euros, so a couple of videos or an afternoon with your map open can quickly turn into dozens of euros without you realizing. With a daily bundle, many operators offer Zone 2 or "world" packages for between €5 and €15 per day, with a fairly strict data limit. This sounds reasonable for one day, but on a two-week trip, these daily bundles accumulate to far exceed the cost of a local SIM card for the entire trip. My advice: if you decide on roaming, definitely contract the bundle before you leave and deactivate data until you activate it; never leave it on by default. And compare numbers beforehand: it will help to read how much international roaming costs and the comparison of eSIM vs. roaming to see the real difference in euros.
Hotel Wi-Fi and free Wi-Fi: useful but limited
Thailand has free Wi-Fi everywhere: hotels, hostels, cafes, shopping centers, many restaurants, and even airports. For budget travelers, it's tempting to rely solely on this and pay nothing for data. It works up to a point, but it has clear limitations that should be understood before trusting everything to the hotel's network.
The first is obvious: Wi-Fi doesn't travel with you. The moment you leave the hotel to get around Bangkok or find a temple in Ayutthaya, you're without a connection precisely when you need a map or translator most. The second is quality: the Wi-Fi speed at a hostel on an island can be extremely slow, and during peak season, it gets saturated with dozens of guests connected at once. The third is security: open public networks are not the ideal place to access your bank or make payments. Free Wi-Fi is a great complement—for downloading offline maps, syncing photos, or making long video calls from your accommodation—but basing your entire trip on it means depending on others' Wi-Fi and being cut off on the street. The sensible thing is to combine it with your own mobile data, not replace it.
Pocket Wi-Fi: the portable router
Pocket Wi-Fi is a small portable router with a data SIM inside that creates your own Wi-Fi network wherever you go. You rent it before your trip or pick it up at the airport, and several devices—your phone, your partner's phone, a tablet—connect to it simultaneously. It was very popular years ago when sharing data among several people was complicated, and it still has its place.
Its advantages are real: a single connection for the whole group and you don't have to touch your phone's SIM. But the drawbacks outweigh the benefits for today's traveler. It's another device to carry: it drains battery quickly (lasts about 6-8 hours), so you end up also carrying a power bank, and if it runs out of charge, everyone loses internet access. You have to pick it up and return it at a specific point, with its deposit and paperwork, and if you lose or damage it, you pay for it. Also, coverage ties you down: if the group splits up, only the person carrying the router has internet. It costs around €5-8 per day, which is more than an eSIM for a single person. If you want to see the head-to-head, I detail it in eSIM vs. pocket Wi-Fi.
Local Thai SIM at the airport
Buying a local SIM is the classic option and remains very valid. As soon as you pass passport control at Suvarnabhumi (Bangkok), Don Mueang, Phuket, or Chiang Mai, you'll see the counters for AIS, True, and dtac with English-speaking staff. They help you choose a package, install the card, and check that it works in 5-10 minutes. You need your passport, as registration is mandatory in Thailand.
Tourist rates are very well priced. For example, AIS's Traveller SIM costs around 399 THB (about €10-11) for 8 days with 15 GB and then unlimited internet at reduced speed; there are 15-day options for 699 THB (~€18) and 30-day options for 999 THB (~€26). True offers very similar packages with maximum speed 5G. The downside is logistics: if you arrive late at night or your flight is delayed, the counter might be closed or have a queue; you have to change cards at the airport, keep your Spanish SIM safe so you don't lose it, and if your phone has only one slot, you lose your number. Even so, the network quality is excellent because you're directly using the local operator. I compare the two formats in eSIM vs. local SIM.
eSIM: my recommended option
An eSIM is a digital card already integrated into your mobile phone and activated by software, with nothing physical to insert. You buy the Thailand plan online, receive a QR code, scan it from your settings, and you're done. The big advantage over a physical card is that you can set everything up from home using your own Wi-Fi before you leave, and when you land, you just need to activate data. No queues or searching for counters.
For a trip to Thailand, it almost always fits for three reasons. First, convenience: you install it in five minutes and avoid the airport hassle just when you're tired from your flight. Second, Dual SIM: the eSIM coexists with your Spanish card, so you keep your number and WhatsApp for bank SMS while data runs on the Thai plan. Third, price: destination plans usually cost similar to or less than a local card, and much less than roaming. The only requirement is that your phone is compatible (most iPhones from the XS and many recent Androids are). If you want to understand the technology well, I explain it in what an eSIM is, and you have the complete guide to the Thailand eSIM with all the steps. For me, it's what best balances price and convenience today.
Comparison of all options
Before diving into coverage and data, this table gives you a quick overview of what each connection method offers and its approximate cost for a typical trip. This way, you can see at a glance which one best suits your profile.
| Option | Approx. Cost | Advantage | Disadvantage |
|---|---|---|---|
| Roaming (daily plan) | €5-15/day | No setup required | Very expensive for long trips; limited data |
| Free Wi-Fi / hotel | Free | No cost, good for accommodation | Doesn't travel with you; slow and insecure |
| Pocket Wi-Fi | €5-8/day | Multiple devices at once | Extra device and battery; pick up and return |
| Local SIM (airport) | ~€10-26 per trip | Low price and operator network | Queues, card change, passport required |
| eSIM | Similar to local SIM | Ready from home; keep your number | Requires compatible phone |
As you can see, the breakdown is clear: Wi-Fi is a free complement, roaming is only worthwhile for one or two isolated days, pocket Wi-Fi makes sense for groups sharing, and the difference between local SIM and eSIM is mainly about convenience. Prices are indicative and change depending on the operator and season, but the order of magnitude remains consistent trip after trip.
4G/5G coverage: Bangkok, Chiang Mai, islands, and ferries
No matter which option you choose, they all use the same Thai networks, so coverage depends on the area and the operator, not the format. The good news is that Thailand is very well-covered on tourist routes, with AIS having the most extensive network (reaching more rural areas and islands) and the True group close behind in cities.
- Bangkok: 5G virtually throughout the city, including indoors, metro, and airports. More than enough speeds for anything.
- Chiang Mai: Full 4G/5G in the urban area and the Nimman district; AIS usually leads in the north.
- Phuket, Krabi, and Pattaya: Excellent coverage on beaches and in resorts. In Patong or Ao Nang, the signal is close to 99%.
- Koh Samui, Koh Phangan, and Phi Phi: Very good in tourist centers and main beaches; may weaken in coves and inland mountains.
- Small and remote islands (Koh Lipe, Koh Kood, Similan Islands, Surin Islands): Basic coverage or dead zones; don't count on 5G.
And on inter-island ferries? You'll maintain a signal near the coast, but it's normal for it to drop for a while in the middle of the journey and return as you approach the pier. AIS usually holds up a bit better. For almost any traveler sticking to common routes, you'll have plenty of signal to navigate with maps, messaging, and video without a problem.
How much data do you really need?
Choosing the right plan means accurately estimating your gigabytes, neither running short nor paying for data you won't use. Consumption depends on what you do with your phone, not on individual days. As a reference, average traveler use—maps for directions, WhatsApp, looking up places, some social media—uses much less data than people fear, because you usually upload photos and long videos over hotel Wi-Fi.
This table gives you a realistic estimate by usage profile:
| Usage Type | Per Day (approx.) | One Week |
|---|---|---|
| Basic: maps, messaging, browsing | ~0.5 GB | 3-4 GB |
| Medium: above + social media and photos | ~1 GB | 5-7 GB |
| Intense: daily video and streaming | ~2 GB or more | 10-15 GB |
Quick rule: For one or two weeks of normal use, a 5 to 10 GB plan is usually more than enough. If you watch a lot of video or make long video calls outside the hotel, go directly for an unlimited data plan at full speed.
A trick to stretch your data: download offline maps for your areas in Google Maps while on Wi-Fi, and set automatic photo uploads to Wi-Fi only. This way, your data plan is dedicated to what truly needs real-time access.
Local SIM vs. eSIM: which to choose
In the end, for most, the choice comes down to these two: a local SIM from the airport or an eSIM. Both are cheap, both use the same excellent Thai networks, and both help you avoid roaming charges. The difference lies in "how," and here the eSIM almost always wins for doing everything without queues or changing cards.
| Aspect | Local SIM (Airport) | eSIM |
|---|---|---|
| When is it ready? | Upon arrival, at the counter | Before leaving, from home |
| Process | Queue + passport + change SIM | Scan a QR code in 5 minutes |
| Your Spanish number | Inactive if you have only one slot | Maintained with Dual SIM |
| Risk of loss | Yes, it's a physical card | No, it's digital |
| Requirement | Any unlocked phone | eSIM-compatible phone |
My practical recommendation: if your phone supports eSIM, buy it before you travel and arrive with internet sorted from the moment you turn on your phone on the tarmac. If your phone is older or incompatible, a local SIM from the airport is a great alternative. You can check plans and prices for the Thailand eSIM and get everything ready in five minutes.
Frequently asked questions
Does the internet work as soon as I land in Thailand?
Yes. With an eSIM installed from home, you just activate data upon landing and connect in seconds. With a local SIM, you buy and activate it at the airport counter in 5-10 minutes. Roaming connects automatically, but it's the most expensive option.
Is there good coverage on islands like Koh Samui or Phuket?
In tourist areas of Phuket, Krabi, Koh Samui, or Koh Phangan, 4G/5G coverage is very good. AIS has the most extensive network. On small and remote islands, the signal is basic and there may be dead zones, so don't expect 5G everywhere.
How many GB do I need for two weeks in Thailand?
For normal use (maps, messaging, social media, and some photos), between 8 and 12 GB is usually enough for two weeks. If you watch a lot of videos or make long video calls outside the hotel, choose an unlimited data plan at full speed.
Can I keep my Spanish number while using internet there?
Yes, with an eSIM and Dual SIM, your Spanish line remains active for calls, SMS, and WhatsApp, while data runs on the Thai plan. With a physical local SIM, if your phone has only one slot, you'll have to remove your Spanish card.
Is free hotel Wi-Fi sufficient for the entire trip?
As a complement, yes, but not as your sole connection. Wi-Fi doesn't travel with you, it can be slow on islands, and public networks aren't secure for banking. Ideally, use it to download maps and upload photos, and have your own data for getting around.
Do I need a passport to buy a SIM in Thailand?
Yes. SIM card registration with a passport is mandatory by law, and airport counters will ask for it. With an eSIM purchased online, the provider handles the registration, so you don't have to do that process upon arrival.
Does eSIM work well on Android as well as iPhone?
Yes, most recent mid-range to high-end Android phones (several Samsung Galaxy, Google Pixel, and current Xiaomi or Motorola models) and iPhones from the XS support it. Check in settings if the "Add eSIM" option appears; if it does, your phone is compatible.
Can I have internet on inter-island ferries?
Near the coast, yes, but in the middle of the crossing, it's normal for the signal to drop for a while and then return as you approach the destination pier. AIS usually holds up a bit better. Download the route on the map before boarding in case you lose coverage.
Conclusion
Getting internet in Thailand is easy and cheap if you decide before you leave. Hotel Wi-Fi is a good complement, roaming only pays off for one or two single days, pocket Wi-Fi makes sense for groups, and between the local airport SIM card and eSIM, both beat roaming by a landslide. For almost everyone with a modern mobile, my choice is clear: install the eSIM from home, keep your number with Dual SIM, and arrive connected from the moment you land, without queues or changing cards. When you're clear, check the plans and days on the eSIM for Thailand and get your trip ready in five minutes.
