https://cellulardata.ubigi.com/rates-and-coverage/japan-data-plans/japan-10gb-30-days/
How to Install and use
https://www.youtube.com/watch?v=JLOwhaw4cnc
How to Activate / Deactivate
https://www.youtube.com/watch?v=icGEEPm-_6A
Overview
Purchase the plan and get a QR code.
On your iPhone:
Settings → Cellular → Add eSIM
Scan the QR code
Label it (e.g., “Japan eSIM”)
When you land in Japan, enable the eSIM and toggle Data Roaming.