Data-only eSIM or one with a Japanese number: Thai bank OTPs and apps that ask for a local number

Data-only plans versus plans with a Japanese number

Most travel eSIMs are data-only: you get internet, but no Japanese phone number. Everything that runs over the internet works, such as chat, maps and translation. Some plans include a Japanese number, or calls and SMS, and the details vary widely, so read each plan's terms carefully.

Which services tend to ask for a Japanese number

There is no fixed list, and each app's rules change, so we cannot promise that any particular app accepts or rejects foreign numbers. Always check in the app. Common categories include:

• Some restaurant booking flows that confirm by SMS.
• Some ride-hailing or food delivery apps.
• PayPay, where full features rely on a Japanese number.
• Loyalty and membership apps of shops and chains.

For most visitors, credit cards, IC cards such as Suica, PASMO and ICOCA (also available in Apple Wallet) and cash are enough, without needing these apps at all.

Keeping your Thai number: bank OTPs and LINE

Thai bank OTPs usually go to your Thai number, so keep the Thai SIM on but switch off its mobile data and roaming. You can still receive texts without using Thai data; check SMS terms while roaming with your Thai provider.

LINE works on your existing Thai account over the eSIM's data, with no Japanese number needed. If you must move the account to a new phone, read “How to move LINE to a new phone without losing your chat history” before you travel.

Workarounds when an app asks for a Japanese number

1. 1Ask the hotel conciergeMany hotels can phone or book restaurants and activities for guests. Tell them early and ask whether any service fee applies.
2. 2Use multilingual booking sitesBooking sites and apps with English or Chinese interfaces often confirm by email, which is easier. Check the confirmation method on each site.
3. 3Choose services that take foreign numbersMany services let you pick the +66 country code at sign-up, but the code will go to your Thai SIM. Check in the app and try registering before you leave.
4. 4Pick a plan that includes a numberIf you really need a Japanese number, choose a plan that includes one and read its terms on receiving SMS and identity checks.

For restaurants that only take phone bookings, prepare a short Japanese message in a translation app and let your lodging make the call. Many popular places take no reservations at all, so you queue or use a ticket machine, which needs no phone number.

All of this lets most visitors travel comfortably without a Japanese number, unless you have a specific reason to need one. If you are unsure whether a particular app or service requires a number, try signing up before you travel and see what actually happens.

Wi-Fi calling and calling over apps

With a data-only plan you cannot place ordinary phone calls, but you can call through apps such as LINE or WhatsApp. Wi-Fi calling on your Thai number depends on your provider and phone model; see our Wi-Fi calling guide for setup, and check charges with your Thai provider first.

Sort it out before you fly: sign up and test

The lowest-risk approach is to register for the apps you expect to use while still in Thailand, when your Thai SIM receives codes easily, and sign in with an email or supported account so you do not need another SMS in Japan. Never share a verification code with anyone, including people who claim to be staff.

• Try registering with your +66 number and see whether it is accepted.
• Keep a backup email and password in case you cannot sign in.
• For Thai banking apps, set up devices and verification methods before departure.

Which option suits which trip

A plan with a Japanese number suits people who know they will need calls or SMS in Japan, such as longer or business trips, but read the terms and any identity requirements.

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