Yes. NTT Docomo and au maintain reliable LTE through the tunnels on the Tokaido Shinkansen. SoftBank can drop to 3G in mountain sections, so if you need unbroken connectivity for a video call or live upload, the eSIM will favor Docomo or au. Expect brief drops in the deepest tunnels near Mount Fuji, but coverage returns within seconds.

Coverage depends on the carrier. NTT Docomo and au have the widest rural footprint; SoftBank thins significantly outside cities. In Hokkaido's national parks (Daisetsuzan, Shiretoko) and the Japan Alps (Kamikochi, Tateyama), expect LTE on Docomo and au in towns and along major roads, but dead zones appear quickly on hiking trails and mountain passes. Download offline maps before leaving the last city.

Yes. The mobile Suica and PASMO apps need live data to generate QR tickets, reload your IC card balance, and sync transaction history. The eSIM keeps you connected so you can top up credit on the train or at a konbini without hunting for a station kiosk. Apple Pay and Google Pay integration also requires a live server ping to authorize each reload.

Budget around 1.5–2 GB for two weeks of active navigation — Google Maps in Japan caches aggressively, so a day of walking Kyoto temples and riding Tokyo Metro might use 80–120 MB. If you also run Hyperdia or Japan Transit Planner for real-time train updates, add another 30–50 MB per day. A 3 GB plan covers most two-week itineraries with room for WhatsApp and photo uploads.

Yes. WhatsApp voice and video calls work over the data connection. A 30-minute voice call uses roughly 15–20 MB; a 30-minute video call burns 150–250 MB depending on resolution. The eSIM has no VoIP restrictions, so you can also use FaceTime, LINE, or Skype without throttling.

Both are strong in central Osaka (Umeda, Namba, the Loop Line). Docomo has a slight edge on 5G density and rural reach — if your itinerary includes Koyasan, Wakayama, or the Kii Peninsula, Docomo will hold signal longer. SoftBank is equally fast in the city but thins faster in mountainous areas. The eSIM will hand off to whichever is stronger at your location.

Yes on platforms, no in tunnels between stations. Tokyo Metro and JR East finished installing antennas on all platforms in 2022, so you get full LTE or 5G while waiting for the train. Signal drops once the train enters the tunnel and returns at the next platform. If you need unbroken connectivity for a live call, wait until you are above ground or on a surface line.

Yes. Both apps need live data to fetch real-time delay updates and platform changes — critical during typhoon season when JR and private railways suspend service with short notice. The eSIM keeps the apps synced so you can reroute on the fly. Offline timetables exist, but they do not reflect weather delays or track maintenance.

The airport SIM counter sells you a physical card, usually on SoftBank's IIJmio MVNO, at a markup with a 20-minute queue during peak arrival hours. You pay in yen or card, hand over your passport for a photocopy, and the clerk activates it. The eSIM costs less, installs in under two minutes via QR code, and hands off between Docomo, au, and SoftBank for better rural coverage. No queue, no paperwork, no single-carrier lock-in.

Yes. Hiroshima city has strong LTE and 5G on all three carriers. Miyajima island has reliable coverage from NTT Docomo and au near the ferry terminal, Itsukushima Shrine, and the main shopping street. Signal weakens on the hiking trails up Mount Misen — expect LTE at the base and summit ropeway station, but patchy or no service on the forested trails between them.

Yes. Hotspot is enabled by default with no extra charge or throttling. You can tether a laptop on the Shinkansen, share data with a travel partner, or run a tablet off the phone's connection. Some Japanese MVNO tourist SIMs disable tethering or throttle after the first gigabyte; the eSIM has no such restriction.

The eSIM itself works normally during typhoons — the issue is that JR and private railways suspend service when wind speeds exceed safety thresholds, and real-time updates only reach you if you have live data. Hyperdia and Japan Transit Planner pull delay alerts from the operators' APIs, so the eSIM keeps you informed when a line shuts down or a Shinkansen is delayed. Offline timetables do not reflect weather disruptions.

Yes in Sapporo; patchy in rural Hokkaido. Sapporo has full LTE and 5G on Docomo, au, and SoftBank. Outside the city — Furano, Biei, Shiretoko, Daisetsuzan — Docomo and au maintain coverage along major roads and in towns, but SoftBank thins quickly. Hiking trails and remote onsen areas often have no signal on any carrier. Download offline maps before leaving Sapporo.