How to set up a Japan eSIM before leaving Thailand, and what to switch on after landing

Step 1: check support and the carrier lock

Not every phone supports eSIM, and a handset locked to a Thai carrier may refuse a foreign profile. Check both points before you buy a plan, because a failed install close to departure day is stressful.

The check takes only minutes, yet a problem found on departure day is far harder to fix. Do it a day or two ahead, and keep the seller's order email or page saved on the phone in case you need to contact support.

• iPhone: open Settings > General > About, look for an EID number, and check that Carrier Lock says no SIM restrictions.
• Android: usually Settings > About phone > Status shows an EID; menu names differ by brand.
• If you are unsure about a carrier lock, ask your current provider before buying.

Step 2: install over Wi-Fi in Thailand

Install on a stable home or office Wi-Fi connection, since the profile has to download. Do not delete the profile afterwards, because most QR codes cannot be reused. The general install flow is covered in our install guide.

1. 1iPhone: scan the QR code or use the seller's appGo to Settings > Cellular > Add eSIM and scan the QR code the seller sent. If the email offers an install button, follow it as instructed.
2. 2Android: add the SIM from the network menuGo to Settings > Network & internet > SIMs > Add eSIM, then scan the QR code or enter the details manually. Some models word the menus differently.
3. 3Ясно подпишите линииRename the lines Thai SIM and Japan eSIM so you never pick the wrong one when changing data settings.

The Thai SIM and bank OTPs: what to set

Many Thai banking apps send OTPs by SMS to your Thai number, so keep that SIM on but stop it using data. Receiving a text normally does not need mobile data, though call and SMS terms while roaming depend on your Thai provider, so check with them.

Travel day: what to switch on, and when

1. At the Thai airport: join airport Wi-Fi, confirm the eSIM profile is still there, and download offline maps.
2. On the plane: use airplane mode and keep the eSIM line off.
3. After touchdown: turn off airplane mode, switch on Japan eSIM, set it for mobile data, and enable data roaming for that line.
4. Wait a minute or two for a Japanese network name to show in the status bar, then test a web page or map.

On arrival at Narita, Haneda or Kansai

The trip into the city is when you need data straight away: Visit Japan Web QR codes, maps and messages to friends. Thai passport holders can currently enter visa-free for up to 15 days per visit, but confirm with the official source before you travel.

• If data has not come up yet, use the airport's free Wi-Fi while you troubleshoot, but treat it as an open network and avoid banking.
• Save screenshots of your Visit Japan Web QR codes in case loading is slow.

Troubleshooting: no signal or no data

On network selection: Japan has four main operators, NTT docomo, au, SoftBank and Rakuten Mobile. Travel eSIM plans usually ride on one or two of them. If automatic mode cannot find a signal in a given spot, switching by hand to a network the plan supports often helps, so check which networks your plan uses.

On APN: most plans configure it automatically. If the seller tells you to enter it by hand, copy the values exactly. If that still fails, contact the seller's support with screenshots.

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