When should I install and activate my Japan travel eSIM for Hokkaido?

Install your Japan travel eSIM at home a day or two before departure while you have stable Wi‑Fi. Follow the QR code or installation link and complete the setup, but don’t switch your active data line to the eSIM yet. The validity period of most plans only starts once your eSIM connects to a supported network in Japan, so you won’t lose any days by preparing early. After landing at New Chitose or another Japanese airport, simply enable the eSIM in your phone settings and set it as your mobile data line to go online immediately.