Hakone eSIM
Hakone is mountains, a lake and a volcano: the ropeway, the boat across the lake and Mount Fuji on a clear day. Coverage between the hills can vary, so install a Japan plan that names its network before you leave Tokyo.

Before your Hakone trip
A short trip from Tokyo
The express train from Tokyo to Hakone-Yumoto takes about an hour and a half. Install the eSIM the night before, and the journey itself stays online.
The loop runs on live times
Ropeway, boat and buses connect on tight schedules. Keep the timetables online with the travel eSIM and leave your home SIM for calls.
Mountains in the middle
Valleys and peaks can change the signal, so the plan card names the network it uses. Read it before you count on full bars at the viewpoint.
A few things before you fly.
How do I get to Hakone from Tokyo?
The express train from Shinjuku reaches Hakone-Yumoto in about an hour and a half, with the ropeway and the lake boats connecting from there. Install the eSIM before you leave so the maps and timetables stay online.
Is the signal good in the mountains?
The towns and the main transport links are covered, and the valleys can differ. The plan card names the network it uses; check it against the route you plan to take.
Is one day enough for Hakone?
A day covers the loop and a Fuji view on a clear day, while two days leave room for an onsen and a slower pace. Either way the same Japan plan covers the trip.