Best eSIM for Thailand: A Complete Guide for Belgian Travelers (2026)
What is the best eSIM for Thailand? Local networks, coverage, prices, and practical tips for staying connected in Bangkok, Phuket, Chiang Mai, and the islands from the moment you arrive.
Thailand is one of the favorite destinations for Belgian travelers. Bangkok, Chiang Mai, Phuket, Koh Samui, Koh Phangan, Pai — whether you're a fan of temples, beaches, street food, or mountain treks, this country has something to allure for any length of stay.
And no matter how you travel, one thing is certain: you'll need internet. To navigate the streets of Bangkok with Google Maps, to order a Grab (the local Uber), to find that secret beach on Ko Tao, to send photos to your loved ones, or to organize your next bus or train journey.
Thailand is not in the European Union, which means your Belgian subscription does not apply under the same conditions. Roaming can quickly become expensive. Here's everything you need to know to stay connected without breaking your budget.
Internet in Thailand: A Solid Mobile Infrastructure
Contrary to what some travelers imagine, Thailand boasts a highly developed mobile infrastructure. 4G LTE coverage is excellent in cities and tourist areas. 5G is being rolled out in major cities like Bangkok.
The Two Major Thai Operators
AIS (Advanced Info Service): The largest operator in Thailand by subscriber count. Excellent 4G/5G network in Bangkok and the provinces. Extensive coverage even in rural areas and mountainous regions of the North.
TrueMove H: A subsidiary of the True Corporation group, TrueMove H is known for its coverage in island and coastal areas. Particularly strong in Phuket, Koh Samui, and the islands of the Gulf of Thailand.
DTAC (now merged with True): Following the merger between True and DTAC in 2023, the combined network has become one of the most powerful in the country.
When you use an Arivia eSIM for Thailand, your connection goes through one of these partner networks — just as if you were a local subscriber.
Coverage by Region and Islands
Bangkok
The Thai capital offers almost complete 4G/5G coverage. On the BTS Skytrain, MRT (metro), shopping malls, floating markets, Khao San Road, or Sukhumvit — the connection is reliable everywhere. You can use the official MRT app, order Grab, and navigate in real-time without ever losing signal.
Chiang Mai and the North
The northern region has good 4G coverage, especially in urban areas and tourist sites like Doi Inthanon. In remote mountainous areas (tribal areas, forest treks), coverage can be intermittent — but the two major operators have made significant efforts in recent years.
Phuket, Krabi, and the South
Excellent coverage on Phuket island, Patong Beach, Kata, Karon, and Kamala. Krabi Town and Ao Nang are very well covered. Coverage extends to Phi Phi islands and Koh Lanta.
Koh Samui, Koh Phangan, Koh Tao
These three Gulf islands are well covered by 4G. Koh Samui has the best connectivity of the three — excellent for business travelers and digital nomads. Koh Phangan offers good coverage in Haad Rin and main areas. Koh Tao has decent coverage in diving areas and main villages.
Rural Areas and Isolated Temples
For adventurous travelers who venture off the beaten path — temples lost in the jungle, remote waterfalls, mountain villages — coverage may be more limited. In these areas, AIS generally has the best penetration.
How Much Does Internet Cost in Thailand from Belgium?
Option 1: Roaming via your Belgian operator
Thailand is outside the EU — Belgian roaming rates apply in full.
| Solution | Cost |
|---|---|
| Roaming without plan | Several €/MB |
| Proximus daily plan | ~€10–12/day |
| Orange daily plan | ~€10–12/day |
| Total for 7 days | €70–84 |
| Total for 10 days | €100–120 |
| Total for 14 days | €140–168 |
Option 2: Local SIM card on arrival
Prepaid tourist plans are available at AIS and TrueMove H stores at Bangkok airports (Suvarnabhumi and Don Mueang) and at all 7-Eleven stores in Thailand.
| Plan | Indicative Price | Data | Duration |
|---|---|---|---|
| AIS Tourist SIM | €8–15 | 8–20 GB | 8–30 days |
| TrueMove H Tourist SIM | €8–12 | 10–30 GB | 8–30 days |
Disadvantages: Your Belgian number is inactive. Process on arrival (queue at the airport). Passport registration required.
Option 3: Arivia eSIM
| Plan | Indicative Price | Data | Duration |
|---|---|---|---|
| Thailand eSIM | €12–18 | 10 GB | 30 days |
| Asia eSIM (multi-country) | €15–25 | 10–15 GB | 30 days |
Savings compared to roaming for 7 days: €55–70.
Practical Use of Internet in Thailand
Essential App: Grab
Grab is the Thai equivalent of Uber — the main taxi and delivery app in Thailand. In Bangkok, Phuket, Chiang Mai, and all major cities, it's the most convenient and cheapest way to get around. The app requires an active internet connection.
Tip: Install Grab and create your account before arriving in Thailand. Some registration features require a stable connection.
Digital Payments and QR Codes
Thailand is very advanced in digital payments. Many restaurants and markets accept payments via QR code. Banking apps and Google Pay / Apple Pay work wherever you have a connection.
Google Maps and Navigation in Bangkok
Bangkok is a complex city to navigate — intense traffic, winding alleys, superimposed BTS/MRT system. Google Maps is your best ally. Download the offline map of Bangkok before departure to save data.
Translation Apps
Google Translate with the camera function (instant translation via camera) is extremely useful in Thailand, where menus and signs are often only in Thai. This function requires a connection for real-time processing.
How much data should you plan for Thailand?
| Type of Trip | Estimated Daily Usage | Total for 10 Days |
|---|---|---|
| Bangkok / Chiang Mai City Trip | 300–500 MB | 3–5 GB |
| Island hopping (islands + boats) | 200–400 MB | 2–4 GB |
| Active travel (maps, social sharing) | 400–700 MB | 4–7 GB |
| Digital Nomad / Remote Work | 700 MB – 1.5 GB | 7–15 GB |
General recommendation for 10 days in Thailand: a 7 to 10 GB plan comfortably covers almost all tourist uses.
Step-by-step: get connected in Thailand as soon as you land
1 week before departure
- Purchase your Arivia eSIM for Thailand online
- Install the profile via the QR code on your home Wi-Fi
- Name the profile “Arivia — Thailand”
- Set the eSIM as the default data source
- Deactivate data roaming on your physical Belgian SIM
The day before
- Download offline maps of Bangkok, Phuket, or Chiang Mai in Google Maps
- Install Grab and create your account
- Disable automatic updates (Wi-Fi only)
- Disable automatic cloud backup on mobile data
Upon arrival at Suvarnabhumi or Don Mueang
- Deactivate airplane mode → automatic connection to AIS or TrueMove H
- Open Grab and order your first taxi → you are connected and on your way
Frequently Asked Questions about eSIM in Thailand
Does the eSIM work from Bangkok airport? Yes. Suvarnabhumi and Don Mueang airports are covered by AIS and TrueMove H. Your eSIM connects automatically as soon as you deactivate airplane mode after landing.
Can WhatsApp be used normally in Thailand? Yes. Thailand imposes no restrictions on WhatsApp or VoIP services. You can call, message, and make video calls normally.
Is there 5G in Thailand? Yes, 5G is available in some areas of Bangkok and major cities. In practice, 4G LTE is sufficient for all common uses and available throughout tourist Thailand.
Does the eSIM work on the islands of Thailand? Yes, on the main tourist islands (Phuket, Koh Samui, Koh Phangan, Koh Lanta, Koh Tao, Phi Phi islands). Coverage is good in populated areas and main beaches. In more remote areas of the islands, the connection may be weaker.
Is the eSIM useful for trekking in the North? In urban areas of Chiang Mai and accessible tourist sites, yes. For deep treks into remote mountainous regions, coverage can be intermittent — regardless of the solution (roaming, local SIM, or eSIM).
Do I need to register my eSIM with my passport? No. Regulations on SIM registration concern physical SIM cards purchased locally. An international eSIM from a provider like Arivia does not require local registration.
Does the eSIM also work in Malaysia or Cambodia if I extend my trip? Some Arivia eSIM plans cover multiple countries in Southeast Asia. Check your plan's coverage before you go.
Conclusion: eSIM, the Ideal Solution for Traveling in Thailand
Thailand deserves to be experienced fully — not half-connected. Whether you're partying on Khaosan Road, meditating in a temple in Chiang Mai, or diving around Koh Tao, you want to be able to share these moments, navigate freely, and stay reachable.
The Arivia eSIM offers you all of that at a fraction of the cost of Belgian roaming. Install it before you leave, and as soon as you set foot on Thai soil, you're connected — no queues, no passport registration, no unpleasant surprises on your bill.
Choose your Arivia eSIM plan for Thailand and start your connected journey from the first step off the plane.