Best eSIM for Thailand for Australians: What to Know Before You Fly

Roamza sells travel eSIMs for Thailand, and this guide helps you choose the right one for your trip. You buy before you fly, install at home over Wi-Fi, and switch on when you land — no airport SIM queues and no surprise roaming charges.

The local SIM registration process in Thailand

Thailand requires all SIM cards to be registered. If you buy a local SIM card at an airport kiosk or convenience store, you'll need to present your passport and complete registration in person with the operator. The National Broadcasting and Telecommunications Commission (NBTC) has tightened these rules, requiring passport-based identity verification for foreign nationals.

A travel eSIM bought and installed before departure means you skip this in-person registration process at a Thai kiosk — your eSIM is ready to go before you land.

Do you need data in Thailand?

Free Wi-Fi is available in many Bangkok cafes, hotels and malls, but it's patchy on islands, in tuk-tuks and on long bus journeys. The apps you'll rely on — Google Maps for navigation, Grab for rides, WhatsApp for messaging — all want a connection.

Choosing a Thailand eSIM

Roamza's current Thailand plans are unlimited daily eSIMs. You pick a duration that matches your trip, and each day you get a set amount of high-speed data followed by unlimited data at a reduced speed.

Current Thailand plans are available in 1-day and 5-day durations, starting from $5.00. For a short stopover, the 1-day plan is enough. For a typical 5-day holiday, the 5-day plan covers you without topping up.

You can see the current Thailand eSIM plans here.

How Fair Use works on Thailand plans

Each day, you get 1GB of high-speed data — enough for maps, messaging, social media and browsing. After that, you stay connected at up to 512kbps, which is enough for messaging and basic browsing but not for video streaming.

This means you don't have to worry about running out of data — you just get a slower speed after your daily high-speed allowance. Read more about how this works on the Fair Use page.

What you'll use data for in Thailand

• Google Maps — navigation for Bangkok's streets, Phuket's coast and Chiang Mai's old town. Active navigation uses roughly 120–150MB per hour.
• Grab — Southeast Asia's ride-hailing app. Booking rides uses minimal data, but the map view adds up over a day.
• WhatsApp — messaging with family and travel companions. Text messaging uses very little data (around 5–10MB per hour).
• Social media — Instagram and Facebook browsing can use 100–700MB per hour depending on video autoplay.
• Streaming — Netflix or YouTube in standard definition uses around 1GB per hour; HD video uses 3GB or more.

These are approximate estimates — actual usage varies based on app settings, video quality and how often you use each app.

Network coverage in Thailand

Roamza's Thailand eSIMs connect to major Thai networks including AIS, TrueMove H and dtac. Coverage is strong in cities like Bangkok, Phuket and Chiang Mai, along major highways and in most tourist areas. Coverage can be thinner on remote islands and in rural highland areas.

The plans support 4G networks, with 5G available in some locations depending on the network and your device.

Setting up before you fly

Install your eSIM at home over Wi-Fi a day or two before you fly — it takes under two minutes. The eSIM sits inactive until you land and switch it on. For step-by-step instructions, see the installation guide.

On a compatible dual-SIM phone, you can keep your Australian SIM installed for calls and SMS while using the eSIM for data. Check the compatibility checker to confirm your phone supports dual SIM.

Your Australian carrier may offer international roaming, but it can be expensive — check your carrier's current roaming rates before travelling. See how it works for more on travel eSIMs vs roaming.

Roamza's plan options and prices can change. Check the Thailand plans page for current availability.