Getting Online on Arrival in Thailand

The Thailand Digital Arrival Card is an online form submitted before arrival or during arrival, and completing the form requires an internet connection. The digital form creates an arrival requirement that travelers need to address before relying on mobile data at the airport. A saved confirmation provides an offline reference if airport connectivity is unavailable during immigration processing. Device compatibility checks confirm eSIM support before installation begins. The pre-install stage prepares the travel line before departure, while the first 20 minutes after landing focus on activation and connection checks. The page covers the arrival card, device checks, the pre-install, and the first 20 minutes after landing. Plan selection starts by reviewing the available plan tiers to install.

The Thailand Digital Arrival Card

The Thailand digital arrival card requires an online submission before entry into Thailand. Internet access is required during submission. The Thailand Digital Arrival Card is an online form submitted before arrival, replacing the traditional paper arrival card, and completing the form requires an internet connection. The official Thailand Immigration Bureau states that foreign travelers must submit the TDAC within 3 days before arrival, including the arrival date, according to the Thailand Immigration Bureau (September 17, 2026), via the Official Thailand Digital Arrival Card (TDAC). The form requests passport details, flight number, arrival date, address in Thailand, travel purpose, health declaration information, and an email address. Current entry instructions rely on the official requirements and updates provided by the relevant Thai authorities.

Follow the five steps listed below to complete the Thailand Digital Arrival Card.

• Prepare the required information. Passport details, flight information, accommodation details, travel purpose, health information, and an email address are required for submission.
• Submit within the permitted window. The official portal accepts TDAC submissions within 3 days before the arrival date, including the arrival date.
• Complete the form before departure. Home WiFi provides the connection required for submission before the journey begins.
• Save the confirmation offline. Keep the submitted TDAC confirmation accessible on the phone so the reference remains available without an internet connection.
• Check the official portal before travel. The Thailand Immigration Bureau remains the authoritative source for TDAC requirements and procedural changes. The information was checked on September 29, 2026.

Filling it in before you fly

Filling the form in before a traveler flies reduces arrival tasks at the airport. Home WiFi provides the connection needed for submission. Offline storage keeps the confirmation accessible after landing.

Fill the form by following the four steps listed below.

• Open the TDAC portal. Enter passport, travel, accommodation, and health information before submission.
• Submit the arrival card. Complete the form during the permitted 3-day submission window before arrival, including the arrival date.
• Save the confirmation. Download the TDAC confirmation containing the QR code as a PDF, or save a clear screenshot showing the confirmation details.
• Keep an offline copy. Store the PDF or screenshot in the phone gallery or files app, so the confirmation remains available without data.

What if you land without completing it

The TDAC can be completed after landing if the form was not submitted before departure. Airport internet access provides a connection for reaching the official portal, while airport WiFi provides another option where available. Mobile data through an active Saily eSIM provides an additional connection route after landing. Completion requires the required passport and travel information. The confirmation needs to remain accessible after submission for arrival processing.

Check your phone before you buy

Check the phone before buying by confirming eSIM hardware support, carrier lock status, and regional eSIM availability. The EID provides a hardware check. A missing EID requires further model and regional verification.

Check the phone before buying by following the three steps listed below.

• Check eSIM hardware. On iPhone, open Settings, select General, select About, then locate EID. On Google Pixel, open Settings, select About phone, select SIM status, then locate EID. On Samsung Galaxy, open Settings, select About phone, select Status information, then locate EID.
• Check carrier lock. On iPhone, open Settings, select General, select About, then locate Carrier Lock. The status needs to show “No SIM restrictions” for an unlocked device.
• Confirm regional support. Check the exact phone model and sales region for eSIM support before purchase. Regional eSIM availability varies by model and market.

Installing before departure

Installing before departure prepares the Saily eSIM before the journey begins. Home WiFi provides the connection required for installation. Activation needs to wait until arrival, as explained by the short plan clock warning. Buy the plan, open the Saily app, add the eSIM to the phone, and leave the line switched off until landing in Bangkok, Phuket, or Chiang Mai.

Install the Saily eSIM before departure by following the six steps listed below.

• Buy the plan. Select the Thailand plan in the Saily app and complete the purchase before departure.
• Open the app. Sign in to the Saily account and select the purchased Thailand plan.
• Add the eSIM. On iPhone, open Settings, select Cellular, select Add eSIM, then follow the installation instructions. On Android, open Settings, select Network and internet or Connections, select SIMs or SIM manager, then choose Add eSIM.
• Complete installation. Keep the phone connected to home WiFi while the eSIM profile downloads and installs. Installation requires internet access but does not start the validity clock.
• Keep the travel line off. Leave the Saily eSIM disabled after installation. The travel line remains ready for activation after landing.
• Activate after landing. Enable the Saily eSIM after arriving in Bangkok, Phuket, or Chiang Mai. Activation starts the validity clock, while purchase and installation do not start plan validity.

Settings to change before your flight

The settings to change before travelers' flight are focused on data routing, roaming, messaging, and updates. Each setting supports controlled connectivity during arrival. The correct configuration reduces unintended home network usage.

The settings to change before travelers' flight are shown in the table below.

Apps to download on home wifi

The apps to download on home wifi are travel tools for navigation, transport, translation, and arrival records. Offline access reduces reliance on airport connectivity. Preloading key tools keeps arrival tasks accessible.

Download the apps on home wifi by following the four steps listed below.

• Download offline maps. Save maps for Bangkok and the first destination before departure, covering airports, accommodation, and nearby roads.
• Install the ride-hailing app. Complete registration before departure because a new number after arrival complicates verification or account access during the first ride.
• Download Thai translation. Install a translation app and download the offline Thai language pack for use without mobile data.
• Save the arrival confirmation. Keep the Thailand Digital Arrival Card confirmation as a screenshot or PDF for offline access during arrival processing.

The first 20 minutes after landing

The first 20 minutes after landing focus on establishing mobile data before leaving the airport. The sequence starts immediately after arrival. A quick network check confirms connectivity before airport movement begins. After landing at Suvarnabhumi, Don Mueang, Phuket, or Chiang Mai, turn off airplane mode, switch the eSIM line on, confirm the carrier name appears, then load one page before joining the immigration queue.

Follow the four-step landing timeline listed below.

• Activate the eSIM (0 to 5 minutes). Disable airplane mode, enable the Saily eSIM line, and confirm the carrier name appears in the status area.
• Test the connection (5 to 10 minutes). Turn mobile data on and load a webpage with WiFi disabled. Confirm that the page loads through the travel eSIM.
• Check the network settings (10 to 15 minutes). If no network appears within 5 minutes, check that the Saily line is active, data roaming is enabled, and mobile data uses the travel eSIM.
• Connect to airport WiFi (15 to 20 minutes). If mobile service remains unavailable, connect to airport WiFi and retry the network settings before joining transport queues. Airport WiFi provides the fallback connection for troubleshooting and online arrival tasks.

Confirming the eSIM is working

Confirming the eSIM is working requires a carrier check and a live data test. WiFi needs to remain off during verification. A cached webpage does not confirm active mobile data.

Confirm the eSIM is working by following the three steps listed below.

• Check the carrier name. Open the phone status area and confirm that the Saily eSIM displays a carrier name or network connection.
• Load a fresh page. Turn WiFi off and open a webpage that has not been loaded recently. A fresh request confirms mobile data access.
• Confirm the data indicator. Check for the mobile data indicator near the signal bars while the page loads. A cached page creates a false positive because stored content loads without an active connection.

Airport transport and the first ride

The airport transport and the first ride require a suitable connection for digital services. Metered taxis and rail services need less data than ride-hailing. Registration requirements vary across transport apps.

Follow the four steps listed below for airport transport and the first ride.

• Join the metered taxi queue. Suvarnabhumi and Phuket airports provide official taxi queues, where the booking process does not require mobile data after reaching the counter.
• Take the rail link. Suvarnabhumi connects to Bangkok through the Airport Rail Link, which requires route information rather than continuous mobile data. Don Mueang provides access to rail services through nearby stations.
• Book a ride. Grab operates at major Thai airports and requires mobile data or airport WiFi for booking, location access, and driver communication. Registration with a Thai number creates an issue when an app requires SMS verification.
• Check the pickup details. Phuket and Chiang Mai airports provide ride-hailing pickup options, while Don Mueang and Suvarnabhumi provide app-based transport access. A working data connection supports driver location, pickup instructions, and status updates.

Keeping your own number in Thailand

Keep the home number by leaving the home line active for calls and texts while the Saily eSIM carries all mobile data. Saily provides an optional, real US-based wireless phone number that supports voice calls and SMS alongside the Saily data eSIM. The phone number gives travelers an additional calling and texting option without changing the role of the travel eSIM for mobile data. The arrangement keeps bank, airline, and account messages tied to the existing number while the travel eSIM handles internet access. Incoming texts are commonly free, while incoming calls commonly incur charges under the home carrier's roaming terms. Two-factor authentication creates a practical reason to keep the home line available because bank and airline verification codes arrive through SMS. On iPhone, open Settings, select Cellular, select the home line, then turn Data Roaming off. Keep Allow Cellular Data Switching off under Cellular Data, so the phone does not switch mobile data to the home line. On Android, open Settings, select Network and internet, select SIMs, select the home line, then turn off roaming and keep the travel eSIM selected for mobile data. Carrier charges vary by home plan, so incoming call costs require confirmation from the home carrier.

Two Line Setup

Home line: Calls and SMS active, with data roaming disabled.

Saily eSIM: Mobile data active, with data roaming enabled.

Arrival questions

The arrival questions address TDAC submission, eSIM installation, plan validity, airport WiFi, transport apps, connection troubleshooting, and activation points. Each answer gives a direct conclusion followed by practical evidence.

Do I need to fill in the Thailand Digital Arrival Card?

Yes, travelers need to fill in the Thailand Digital Arrival Card before entering Thailand. All non-Thai nationals entering Thailand must submit the TDAC online before entry, according to the Official Thailand Digital Arrival Card (TDAC) by the Thailand Immigration Bureau (September 17, 2026).

Can I complete the arrival card without data?

No, travelers cannot complete the arrival card without data. The Thailand Digital Arrival Card requires an internet connection during online submission. Travelers who land without a completed TDAC can use airport kiosks or airport WiFi to access the official Immigration Bureau portal. The official TDAC guidance confirms that kiosks and internet WiFi are provided for travelers without a smartphone or internet access.

Can I install the eSIM before leaving home?

Yes, travelers can install the eSIM before leaving home. Saily requires an active WiFi or mobile data connection for initial installation, so home WiFi supports preparation before departure. Installing the Saily eSIM does not require waiting until arrival. Saily states that an installed eSIM activates automatically after landing at the destination when the travel line connects to service.

Does the validity start when I buy it or when I land?

No, the validity does not start simply when the plan is purchased. Saily states that an eSIM can be installed and activated within 30 days of purchase, while the data package starts working automatically after landing when the eSIM was installed before the trip. Buying the plan differs from starting data service at the destination.

Is there wifi at Bangkok airports?

Yes, there is WiFi at Bangkok airports. Airports of Thailand provides free airport WiFi at Suvarnabhumi and Don Mueang, with network access requiring registration. Don Mueang Airport specifically instructs users to select “Airport Free WiFi by NT,” enter an email address, accept the terms, and confirm the connection.

Do I need a Thai number for a taxi app?

No, travelers do not need a Thai number for Grab registration. Grab states that tourists do not need a local number to register, while Grab’s Thailand taxi guidance states that first-time registration uses an activation code sent to the submitted phone number. Registering before departure avoids an arrival verification issue when the travel eSIM does not provide a Thai number.

What if my eSIM does not connect on arrival?

The traveler's eSIM does not connect on arrival because the Saily line, roaming setting, mobile data selection, or APN requires checking. Saily provides a defined troubleshooting sequence for activation problems.

Follow the four steps listed below if the traveler's eSIM does not connect on arrival.

• Enable the eSIM. Open the mobile network settings and confirm that the Saily eSIM is switched on.
• Check data roaming. Confirm that Data Roaming is enabled for the Saily eSIM profile.
• Check the APN. Android users with a missing Saily APN need to open the Saily app and keep it open for up to 5 minutes for automatic configuration.
• Contact Saily support. iPhone users with a missing APN or unresolved connection problem need to contact Saily support for assistance.

Which airport should I activate at?

The airport that the traveler should activate at is any arrival airport in Thailand covered by the Saily plan. Suvarnabhumi, Don Mueang, Phuket, and Chiang Mai are major international airports within Thailand, and Saily lists services at each airport location. Activation follows arrival at the destination rather than at a required airport. The Bangkok arrival detail concerns arrival preparation rather than a specific activation point.