PayPay
Japanese numberJapan's most-used QR payment app
PayPay's own help page states that overseas mobile numbers cannot be used and that you need a Japanese mobile number to register.
BEFORE THE JOURNEY
Less setup. More getting lost.
Will a data-only eSIM cover your Japan apps? Check the signup requirements before you land.
Prepare for JapanYour apps. Your trip. Your plan.
Not checked yet. A country goes up only after we’ve read each app’s own sign-up rules for it. Tell us where you’re going
JAPAN / AFTER HOURS · AI-generated editorial image
01 / Japan02 / South Korea ↗Your apps. Your trip. Your plan.
Why “it works fine” and “I couldn’t sign up” are both true
What a data-only eSIM gives you
Data, and nothing else
Maps, messages, translation and browsing all run on data, and all of them work.
What sign-up screens ask for
A phone number
Some accept any number that can receive a text, so keeping your home SIM switched on is enough. Some accept only a local number — and a data-only eSIM has no number to give them.
Japan · checked 11 Sep 2026
The apps in Japan that won’t take a foreign number
Each from the company’s own published material. The full list of ten, with sources and a quick check, is on the Japan page.
d払い (d Payment)
Japanese numberNTT Docomo's payment app
Registration accepts only an 11-digit number issued in Japan. Overseas numbers are outside the scope of the service.
The way round
GO
Works on data aloneJapan's largest taxi-hailing app
GO added sign-up with overseas mobile numbers in November 2023. It also publishes a fallback for people who cannot receive an SMS at all: identity check by passport photo and a selfie, inside the same app. That fallback is what makes it usable on a data-only eSIM with no other line.
THE OTHER SIDE OF THE JOURNEY
A little Seoul, between trips.
Travel preparations here. Everyday stories over there. Two different windows into a connected world.
Meet Seoyeon
Seoyeon is DCC Lab’s AI-created fictional office worker and after-hours creator. Explore her public channels; these are stories, not travel testimonials.
Every claim here is tagged with where it came from and how sure we are. When a company says it in its own help pages, we say so. When it is traveller reports, we say that too, and we do not dress it up.
Some links on country pages earn us a commission. They are marked where they appear, and they do not decide what we list or in what order.