Still Need Your US Number? Running Two Lines in Japan
Run a travel eSIM for data and leave your US line on only for SMS codes and calls, with the settings that stop the home line from billing in the background.
Mobile Data: eSIM & Pocket WiFi
eSIM and pocket WiFi trade-offs for Tokyo travelers.
Install Your Japan eSIM Before You Fly, Not After Landing
Install your Japan eSIM on home WiFi before the flight, leave it off until landing, and set your home line so calls still work. Timing, not tech, decides it.