Internet in Thailand: eSIM, SIM Card, Apps and Practical Essentials (2026)

I’ve lived in Thailand for five years, mostly in Bangkok, with longer stints in Phuket, Chiang Mai and Pattaya. In that time I’ve tried just about every way of staying online here: roaming on day one (a mistake), dozens of local SIM cards, and finally eSIMs. This guide is everything I wish I’d known before my first flight to Bangkok: a comparison of eSIM, local SIM and roaming, real prices and coverage outside the cities, the apps and QR payments this country runs on, and the practical essentials for a longer stay — power plugs, Thai bank accounts, visas, vaccinations and weather advice. And to finish, a few words about culture and safety that will save you more grief than any data plan.

Internet in Thailand: the shortest possible answer

The most convenient option is an eSIM with a data plan bought before you fly: you install it at home and have internet the moment you land, without taking your own SIM card out or hunting for a kiosk at the airport. A local SIM card is cheap too (200–700 baht for a 30-day tourist plan), but it means showing your passport and visiting a shop. Avoid roaming with your home operator: in Thailand, roaming data is billed at expensive international rates no matter which country you’re coming from.

What does roaming in Thailand really cost?

Let me start with my own bill, so we’re clear about the kind of money involved: when I first landed here, I spent a few days on my home operator’s roaming. It cost me the equivalent of about 100 dollars and it was the last bill I ever paid them. After that experience I gave up my home number altogether.

Roaming itself works from the first minute: your phone logs on to a Thai network automatically, right after landing. So the problem isn’t the technology, it’s the pricing: for operators from almost anywhere in the world, Thailand is one of the most expensive roaming zones there is, and cheap domestic or regional bundles (like Europe’s “roam like at home”) don’t apply here. Per-megabyte rates can be high enough that one evening of maps and social media costs more than a local data plan for a whole month. If you don’t buy anything before you fly, switch off data roaming the moment your plane takes off. It’s a similar story in plenty of other places, by the way. You can read how to handle one of them in our separate guide to internet in Turkey.

eSIM, SIM card or roaming? The full comparison

Over my years living here I used local SIM cards from Thailand’s two biggest operators, AIS and True, and it’s their networks that carry practically all the internet in this country. The same networks power BlueSky eSIM plans for Thailand, with one advantage a single SIM card can’t give you: the eSIM connects automatically to one of those two networks, AIS 5G or True 5G, always the one with the better signal wherever you happen to be. You don’t pick an operator manually and you don’t have to commit to one in advance. The phone switches to the stronger network on its own. How is that different in practice from buying a card on arrival? A physical SIM means that after a long flight you look for an operator’s shop or an airport stand, queue up, take your existing card out of the phone and put in a new piece of plastic, and before that you go through mandatory identity registration: the shop assistant scans your passport and takes a photo of your face on the spot. With an eSIM, none of that applies to you: you buy the plan online before you fly and there’s no registration at the airport. Better still, you can buy a Thailand plan and install it on your phone up to 365 days before your trip: the eSIM only activates the moment it connects to a local network after you land, and only from then do the validity period and your data allowance start counting down. And while we’re on data, I recommend unlimited plans: they remove the last thing you’d otherwise have to worry about with travel internet, the usage meter. When I first arrived, that option barely existed, and I really missed it.

At a glance:

An eSIM is a digital SIM card: you buy a plan online, scan a QR code and the profile installs itself on your phone. The big advantages: you set everything up before the trip, the internet works from the moment you land, and your existing card stays in the phone, so you keep receiving SMS messages (bank codes, for example). Almost every iPhone from the XS up supports it, along with most newer Androids. You can check the list of compatible phones.

A local SIM card is the traditional route. You’ll find one at every airport with international arrivals and in many 7-Elevens. You need your passport, because identity registration at purchase is mandatory, and there’s a limit of a few cards per person per operator. Remember that your phone has to be unlocked (no SIM lock).

Roaming is for emergencies: receiving an important SMS, a short call. For everyday internet it’s the most expensive route you can take.

Which SIM card in Thailand? AIS or True

In practice the market now belongs to two operators: AIS and True, which took over the third player, the dtac network, in 2023. Both have English-speaking support, English-language apps and stands at airports and in shopping malls. Coverage is comparable in cities and resorts. Upcountry (especially in the north-east), AIS tends to have the better reputation. BlueSky eSIM for Thailand runs on the infrastructure of both.

How much do SIM cards and internet cost in Thailand?

Tourist SIM plans usually cost 200–700 baht for 30 days (about 6–20 dollars), depending on how much data you want. Top-ups are sold in 7-Elevens and in the operator’s app. Watch out for ATMs: they charge foreign cards a flat fee on every withdrawal, and it has gone up in recent years. In 2026 it’s typically 250 baht on Visa cards and as much as 350 baht on some Mastercards, and the cheapest withdrawals (150 baht) are from AEON ATMs, found mostly in Big C, Lotus’s and Makro hypermarkets. So for small amounts, pay by card or change cash at an exchange booth.

How to set up internet in Thailand, step by step

With an eSIM: buy the plan and install the profile at home by scanning the QR code from the email. And if you’re buying the plan on the same phone you want to install it on, with no second screen to scan from? No problem — the email includes the same code written out as text next to the QR code. You copy it and paste it manually into your phone’s settings when adding the new eSIM. After landing, switch it on as your mobile data line and make sure data roaming is enabled for the eSIM (it’s a local profile, so you’re not paying roaming rates). Step-by-step instructions for iPhone and Android are in our eSIM installation guide. With a physical card: put it in and set it as the default for data. The APN configures itself.

What are coverage and internet speeds like in Thailand?

I found out how good the coverage here is during a longtail boat ride through the Thonburi canals in Bangkok. Between the wooden stilt houses, it wasn’t just maps that worked the whole way, but video streaming and video calls with my family too. If the internet holds up on the water, in a maze of khlongs, you have nothing to worry about in a Phuket hotel or a Chiang Mai cafe.

In the years we lived just outside Bangkok, I never installed a fixed line, and that’s probably the best review of the mobile networks here: I worked remotely in IT entirely on an unlimited phone data plan. Video calls, YouTube, Netflix in the evening, all at once. My speeds reached 200 Mbps, and slowdowns were rare, no more frequent than on plenty of fibre connections in Europe. Upcountry, it varies, because no two provinces are alike: along the main routes, in cities and resorts, 4G/5G is reliable, while deep inland, in the mountains or on small islands, you should expect weaker LTE. A simple rule: where there are people, there is fast internet.

What about Wi-Fi? It’s practically everywhere: almost every hotel and hostel has a free network, as do all the bigger airports, a huge share of cafes and even plenty of bars. The trouble is that your whole trip happens between one Wi-Fi network and the next: maps on the road, a translation app at the market, Grab outside a temple. So treat hotel Wi-Fi as a supplement for the heavy stuff (photo backups, films for the evening) and run your day-to-day on a data plan. Avoid logging in to your bank on public networks. If you must, do it over mobile data or a VPN.

Coverage is better than many people expect. Mobile coverage, from 3G to 5G, reaches about 95% of the country, and as of mid-2024 Thailand’s fixed-line internet ranked seventh in the world for speed. In Bangkok, Chiang Mai, Phuket and Samui, mobile internet is fast and stable. It gets weaker in national parks, on small islands and in the far north: coverage there can vanish entirely, and the bungalow Wi-Fi “works in the lobby”. In the rainy season, heavy downpours can briefly choke the connection.

When is the best time to visit Thailand? Dry season and rainy season

What does the rainy season look like in practice? I put it to the test myself: in October, at the very tail end of the monsoon, I toured Phuket on a scooter. The rain came in short, violent bursts with sunshine in between. Ponchos for less than 100 baht from 7-Eleven solved the problem, the viewpoints were nearly empty and hotels cost a fraction of their high-season prices. The best view of that trip I owe to the weather, in fact: the Big Buddha on the Nakkerd Hills, 45 metres of white marble, was completely swallowed by fog and kept emerging from it piece by piece. Most tourists only ever know it in full sunshine.

A small confession at this point: when I was travelling and taking these photos, I wasn’t planning to write a blog yet. None of them were shot with publication in mind, which is why many simply show me or my girlfriend, the way you photograph ordinary private memories. I decided that’s more honest than staging perfect shots years after the fact.

If you’re wondering when to visit Thailand, start with the weather calendar. Thailand’s climate is tropical and the year splits into three seasons: dry and “cool” (November–February), hot (March–May, peaking in April, with heat reaching 40°C) and rainy (roughly May–October, with the peak from July to October). The tourist season is the dry season: pleasant temperatures, little rain, but also the highest prices and the biggest crowds, especially around Christmas. April is the hottest month of the year, with temperatures regularly above 35°C. On the islands the sea breeze helps. April also brings Songkran, the Thai New Year and the world’s biggest water fight, so book your accommodation well in advance.

When is the rainy season in Thailand, and when is the dry season?

Across most of the country, meaning Bangkok, the north and the Andaman coast (Phuket, Krabi), the rainy season runs roughly from May to October. There is one important exception. On the central Gulf coast — Ko Samui, Ko Pha-Ngan and Ko Tao — the calendar is flipped: while the rest of the country gets soaked, the dry season is in full swing there, and the rains arrive later, roughly October to December. So when planning an “escape from the rain”, it’s easy to jump out of the frying pan into the fire, or the other way round — a sunny holiday on Samui in the middle of the “rainy season”. Rain rarely falls all day anyway. Short, intense afternoon downpours are the norm. In exchange you get fewer tourists and noticeably cheaper hotels.

Thailand weather month by month

As a rough guide for Bangkok and the surrounding area: December–February is around 28–29°C with barely 1–2 rainy days a month. March–April is 30–32°C (in the north, March is the field-burning season and the air in Chiang Mai gets worse). May–June is the start of the rains, with around 16 rainy days a month. July–October is the peak of the monsoon, 17–21 rainy days a month at around 29°C. November brings a quick end to the rains, (about 6 rainy days a month). One surprise — in the mountains of northern Thailand, dry-season nights can get cold and a jacket comes in handy.

What you actually need internet for in Thailand: apps and QR payments

Five areas where the internet really makes a difference:

Transport. The essential app is Grab, Asia’s answer to Uber: you see the fare up front, before you order; it stays fixed regardless of traffic; you pay by card in the app; and the driver sees your destination on the map, so the language barrier disappears. Bolt works here too, usually a little cheaper than Grab, but with fewer drivers, and outside the centre there isn’t always one nearby. Classic metered taxis are cheap as well, though you do need to keep an eye on whether the driver has actually switched the meter on. Over short distances, motorcycle taxis rule. You’ll recognise them by the drivers’ orange vests; just don’t count on getting a helmet. Tuk-tuks these days are more of a tourist attraction than a practical way of getting around: you ride one once, for the experience, always after agreeing the price first.

Food. Food delivery operates on a huge scale here: GrabFood, Foodpanda (the friendliest if you don’t speak Thai) and LINE MAN, the delivery arm of LINE, Thailand’s most popular messaging app. That’s an important detail: Thais don’t use WhatsApp. Their everyday messenger is LINE. If you’re planning any kind of contact here, from renting a flat to booking a diving course, that app and a working internet connection are all you need. In our building, LINE handled all communication with the condo front desk: announcements about fire drills, pool water changes, insect spraying and lost property handed in at reception. It served as a sort of interactive notice board for the whole building. One warning from experience: LINE also behaves a bit like social media, and if you add too many contacts and official accounts, you’ll be flooded with daily spam that buries the messages from your friends, and those are really the only ones that matter to you. Add contacts sparingly.

Payments. Thailand leapfrogged from cash straight to QR codes: locals now pay by scanning QR codes linked to Thai bank accounts, practically everywhere, from shopping malls to fruit carts. As a tourist without a Thai account you’re mostly outside that system, so the rule is simple: your payment card works in malls and chain stores, and for markets and street food carry cash in small notes, because the vendors don’t take cards.

If you’re staying longer: a Thai bank account. Most ATM withdrawals on a foreign card cost 250–350 baht in fees (they’ve gone up in recent years), so on a longer stay a local account pays for itself very quickly, and it unlocks QR payments too. Fair warning, though — this is not just a formality. I opened my account at the main branch of one of Bangkok’s biggest banks. Alongside the basic baht account I wanted to open a second, foreign-currency account with the same bank, in dollars or euros, to hold savings and receive transfers from abroad more conveniently. The bank refused, and I ended up with an account held in baht only. The bank also demanded a document from my country’s consulate confirming my passport was genuine, signed by the consul in my presence. That cost me 1,000 baht and two weeks of waiting for an appointment, which had to be booked through the consulate’s website. A very odd requirement, but that’s what applied at the time. Around the same time a friend of mine opened an account elsewhere practically by walking in off the street, though for a hefty fee. The same errand can look completely different depending on the branch and your luck. Since 2025 it’s been an even steeper climb: banks have been known to close foreigners’ accounts without warning if the holder has no long-term visa, and opening a new one has become harder still. In practice you now need a visa valid for at least a year. The rules change fast, so check the current requirements on the bank’s website before you visit. And you should know that in Thailand the final decision often comes down to the individual clerk at the branch anyway. In that conversation, your best backup is exactly the information you found earlier on the bank’s own official website.

Getting in from the airport. From Suvarnabhumi to central Bangkok the fastest way is the Airport Rail Link: about 30 minutes and 45 baht, a little over a dollar. A taxi is around 300 baht and a traffic lottery — anywhere from 45 minutes to well over an hour. From Don Mueang, the capital’s second airport, buses and taxis run at similar prices. In Phuket the cheapest option, and the one I recommend, is the bus at around 100 baht, which will take you to Phuket Town or to Patong. The buses loop around practically the whole island. There’s just one catch: right outside the terminal, pushy taxi touts latch on to tourists, trading on the fact that hardly anyone knows about the buses. Pay them no attention: leave the airport building through the main exit, turn left, and about 150 metres on you’ll find the buses. A taxi from this airport costs 500–1,000 baht. In every one of these scenarios, internet that works from the moment you land makes the difference: you check the bus route or book a ride in the app yourself, instead of relying on the first tout who spots you.

Practical essentials: power plugs, currency, safety

Two things catch new arrivals out. The first: bringing e-cigarettes into Thailand is formally banned (vaping is common here, but the law says what it says, and it does get enforced against tourists). The second: alcohol is sold only at set hours — in shops you can buy it between 11:00 and midnight (until 2026 there was an additional afternoon break between 14:00 and 17:00). On religious holidays and election days, alcohol sales can be suspended entirely, and bars simply stay closed. Thailand’s dialling code is +66. The whole country sits in a single time zone, GMT+7, with no daylight saving. The easiest way to check the current time difference from home is the world clock on your phone.

Vaccinations: what the official bodies recommend

Good news first: if you’re arriving from Europe or North America, there are no mandatory vaccinations for Thailand. The only formal requirement concerns yellow fever, and only for people arriving from countries where it’s a risk (Africa, South America) or transiting through one for more than 12 hours. In that case you show an international vaccination certificate at the border; according to the WHO it is now valid for life.

Recommendations are another matter. Government travel-medicine bodies such as the US CDC and the UK’s NaTHNaC recommend above all keeping routine vaccinations up to date (including measles and tetanus), plus hepatitis A and B and typhoid. For longer stays, work with animals or trips into rural areas, a doctor may also suggest rabies (bites from stray dogs and monkeys happen here more often than you might expect) and Japanese encephalitis. For dengue, the most common tropical disease carried by mosquitoes, vaccination isn’t routinely recommended for tourists. Your best protection remains mosquito repellent and long sleeves at dusk, and that’s worth remembering, because for the average tourist dengue is a far more real risk than malaria. Malaria itself is found almost exclusively in the jungles along the borders with Myanmar and Cambodia. In Bangkok, Phuket, Samui or Pattaya the risk is virtually non-existent and no antimalarial tablets are needed. Work out your specific list with a travel-medicine doctor, ideally a few months before you fly, because some vaccines are given in several doses spread over time.

The most important thing about safety here isn’t crime; it’s culture. Thais are warm, polite and calm, and disagreements are settled quietly, with a smile, and by sticking to the point. A raised voice isn’t an argument here, it’s an embarrassment. Western tourists used to a more aggressive style are sometimes caught out, assuming that because a Thai stays calm, he can be shouted down. Not so: push past a certain limit of patience and you can spark a real scene, with random passers-by joining in within seconds to back their countryman against a foreigner, often a much bigger one. You never want to find yourself in that situation. Insulting or humiliating a Thai in front of his family, wife or children is especially dangerous. Public loss of face is a very serious matter in this culture and can have unpredictable consequences. I’m not writing this to scare you, because Thailand is a very safe country and serious incidents are rare. Respect your hosts’ culture and customs, smile, and settle any conflicts calmly if they do come up, and all will be well.

Before you land: four things about Thailand

Four things worth knowing before you first set foot here. Thailand is the only country in South-East Asia that was never a colony of a European power, and Thais are genuinely proud of it. It’s no accident that the country’s name is often translated as “land of the free”. About 93% of the population is Buddhist. Buddha statues must not be touched or climbed on for a photo. People don’t shake hands in greeting; they give a wai: a slight bow with the palms pressed together as if in prayer. And Bangkok’s full ceremonial name (it begins “Krung Thep Maha Nakhon…”) runs to 168 characters, the longest place name in the world according to Guinness World Records. Thais themselves just say “Krung Thep”, the City of Angels.

What power plugs are used in Thailand?

Sockets in Thailand take more than one plug type, usually all at once — flat American pins (Type A/B) and the European Type C plug, the standard across most of continental Europe. You’ll mainly need an adapter for British plugs (Type G) and earthed devices. The voltage is 220 V / 50 Hz, the same as Europe. If a North American device is designed for 110 V only, check its power adapter first.

Currency and payments: how do you pay in Thailand?

The currency is the baht (THB). Cards work in hotels, malls and chain stores, but street food, markets, taxis and small islands are still a cash world. Change money at exchange booths (in Bangkok and Chiang Mai the Super Rich chain has good rates, better than you will get at a bank) and treat ATMs as plan B because of that 250–350 baht fee. For a sense of prices: a meal at a local eatery is 50–70 baht, and national park entry is 200–500 baht. And a legal curiosity worth knowing: the banknotes carry the King’s portrait, and Thailand has some of the strictest lèse-majesté laws in the world. Don’t step on a dropped banknote and don’t keep money in your back pocket.

Is Thailand safe to visit?

Thailand is one of the safest countries in Asia for tourists, and the main risks are mundane. Don’t drink the tap water (buy bottled or filtered). Mosquitoes can carry dengue, so repellent is a must in your luggage, especially in the rainy season. Jellyfish turn up around the islands, so check local warnings before swimming. Buy insurance that covers medical evacuation, and if you’re planning to ride a scooter or go diving, make sure the policy doesn’t exclude those activities. The emergency number is 191, and the English-speaking tourist police are on 1155.

Scooters and driving licences: the thing tourists ignore most often. To ride a motorcycle or scooter legally in Thailand, whatever the engine size, you need a licence with a motorcycle category plus an International Driving Permit covering the same category. Thailand honours the document issued under the 1949 Geneva Convention. In practice it works like this: a rental shop will happily rent you a scooter with no licence at all, for around 300 baht a day, and if the police stop you, it ends with a fine. The real problem starts with an accident: no licence is a ready-made argument for the insurer to refuse to pay out, and insurers are only too happy to use it.

Do you need a visa for Thailand?

For an ordinary holiday, most likely not. Citizens of more than 60 countries, including the whole of the European Union, the UK and the US, enter visa-free for stays of up to 30 days, extendable by another 30 at an immigration office once you’re here. Formally there’s a requirement to hold a return ticket or a ticket for onward travel to another country, and airline staff have been known to ask for it at check-in.

It gets more interesting if you want to stay longer. For years a whole industry of so-called border runs operated here: near the end of your visa-free stay you took a minivan to the Lao or Cambodian border, an immigration officer stamped you out and straight back in, and you were back in Thailand the same day with a new 30-day permission to stay. The Thai government turned a blind eye until late 2025, when the tolerance ended. Border posts were instructed not to admit people abusing the system, and the “border run” business died practically overnight. Today the safe limit is considered to be about four months of tourist stay per year. Beyond that, every entry is a lottery.

And here’s something important that five years in Asia taught me: in Thailand, the written rules can matter less than the individual officer’s decision. I learned this personally, coming back from a trip to China. The officer at Bangkok airport decided I had been in Thailand too long. He didn’t care that it was all legal: I was on a one-year student visa, studying Thai. He simply refused me entry. I was given the choice of flying anywhere I liked (it could have been worse: sometimes they send you back to your country of origin), so I flew to Bali, because I hadn’t seen it yet.

The legal options for a longer stay: the ED student visa (a Thai language school, for example, which is what I used, and the visa can be issued for six months or a year), the DTV (Destination Thailand Visa) — valid for five years, up to 180 days per entry, aimed at remote workers, and it also covers Muay Thai or Thai cooking courses) and the Non-O retirement visa for the over-50s. One note from experience about the ED visa: when you’re handling visa paperwork or returning from abroad, officials sometimes take it upon themselves to test your Thai, and this produces some truly absurd situations. If you’re signing up for a six-month course, it’s worth at least being able to introduce yourself in Thai. I’m preparing a separate, detailed article about visas.

Bangkok after five years: a few words to finish

After five years of living in Bangkok I still haven’t grown tired of it, and I say that as someone who came here “for a little while”. It’s a city with superb infrastructure, where the BTS Skytrain moves you around faster than many European metros. And despite the city’s scale there’s always some rooftop, temple, market or restaurant you don’t know yet. It’s not a place you can take in on any single holiday. One last tip from daily commuting: avoid the end of the working day around 17:00, and on New Year’s Eve don’t get on the BTS at all, because the stations can jam up completely, and there’s nothing pleasant about being stuck on a platform while the whole city parties and watches the fireworks over the Chao Phraya.

One thing I’ll admit honestly: when I first came here I thought I’d assimilate quickly, since Thais are so polite and open. Five years on, I know I’m still a long way from truly understanding the Thai mentality. This culture can surprise you daily, and that’s the best thing about it. What reliable internet on your phone gives you in all this is one certainty: that from any side street, any market without a single tourist, any 60-baht food cart, you’ll find your way back to the hotel. Which is why I sort my internet out once, before the flight, and never think about it again. An eSIM for Thailand is meant to work in the background. Your attention belongs on the trip itself.