What breaks when you travel on a data-only eSIM — checked country by country.
Japan · Japan's most-used QR payment app
No.
PayPay says overseas mobile numbers can’t be used and asks for a Japanese mobile number at sign-up. A data-only eSIM has no number, and your home number isn’t accepted either.
海外の携帯電話番号は利用できません。日本の携帯電話番号をご用意ください
In English: “Overseas mobile numbers cannot be used. Please have a Japanese mobile number ready.”
How sure we are
We read this in the company’s own published material.
Next check
By 6 Nov 2026. Apps change their sign-up rules without notice; if you see something different, tell us at [email protected].
| App | Data-only eSIM on its own | With your home SIM on | Basis |
|---|---|---|---|
| PayPay | Doesn’t work | Doesn’t work | Company's own documentation |
| d払い (d Payment) | Doesn’t work | Doesn’t work | Company's own documentation |
Gate B — Japanese number required
No foreign number passes, no matter which carrier issued it — so neither a data-only eSIM nor your home number gets you in.
Won’t take a foreign number
Refuse lines without voice calls
Need a number that can receive a text
Work on a data-only eSIM on its own