How can I stay online in Japan snow cities without roaming?

To stay online in Japan’s snow cities without roaming, turn off data roaming on your home SIM and use a Japan eSIM or local data plan instead. Purchase and install the eSIM profile before your trip, then set it as your main data line in your phone settings. Once you arrive, your phone will connect to a local network using the eSIM, giving you full-speed data for navigation, messaging, and weather checks while your home number remains available only for calls or SMS if needed. This approach lets you enjoy reliable connectivity in places like Sapporo, Nagano, or Kanazawa without surprise roaming charges.