Japan 50GB 30 days
NTT docomo / Rakuten Mobile / KDDI/au
Exits in Hong Kong · NTT docomo / Rakuten Mobile / KDDI/au
- データ
- 50GB
- 有効期間
- 30 days
- テザリング
- 可
- 通信方式
- 3G / 4G / 5G
- 5G対応
- テザリング
- 追加チャージ対応
Validity starts on first connection at the destination
Wide avenues and factories, as many work trips as holidays, and a base for the mountains.
公開: 2026年9月21日最終更新: 2026年9月21日
Chubu Centrair (NGO) stands on a reclaimed island in Ise Bay, so the train into town crosses a long bridge before it touches land. Turn the eSIM on in the cabin and confirm bars before you go down to the platform; over the water the line softens a shade and firms up on the mainland side. It delivers you to Nagoya Station, a single building stacking Shinkansen, local rail and subway together — the same place Shinkansen arrivals step out, line already live from the previous city.

Nagoya does not market itself the way Kyoto does, so its visitors are a mix: people meeting suppliers, people breaking a journey before the mountain line north, and people who came specifically to eat the things this city is known for. The avenues are wide and the blocks are long, which makes real walking distances further than the map suggests. The subway is thorough and the line holds across nearly every station. Connectivity here is a thing you stop thinking about until you leave the plain.
Chubu Centrair (NGO) stands on a reclaimed island in Ise Bay, so the train into town crosses a long bridge before it touches land. Turn the eSIM on in the cabin and confirm bars before you go down to the platform; over the water the line softens a shade and firms up on the mainland side. It delivers you to Nagoya Station, a single building stacking Shinkansen, local rail and subway together — the same place Shinkansen arrivals step out, line already live from the previous city.
From the station district across to Sakae the line runs unbroken, including the underground passages beneath avenues wide enough to surprise first-time visitors. The parks and open plazas in the middle of town are easy. South towards the port, industrial estates and housing blocks are both well covered. The change comes on the northbound trains into the Gifu hills, where the track starts following a river through a chain of tunnels and the connection breaks valley by valley.
Business visitors often land around 1–2GB a day, between calls, file transfers and screen sharing from the hotel. Leisure visitors use less, roughly 700MB–1GB, because getting around takes little thought. Tether a laptop for a working afternoon and the number jumps more than expected, since background file sync spends data quietly; pause automatic sync on the big folders and let it run on Wi-Fi in the evening instead.
Japan plans work country-wide, Nagoya included.
NTT docomo / Rakuten Mobile / KDDI/au
Exits in Hong Kong · NTT docomo / Rakuten Mobile / KDDI/au
Validity starts on first connection at the destination
NTT docomo
Exits in Japan · NTT docomo
Validity starts on first connection at the destination
NTT docomo / Rakuten Mobile / KDDI/au
Exits in Hong Kong · NTT docomo / Rakuten Mobile / KDDI/au
Validity starts on first connection at the destination
KDDI/au
Exits in Singapore · KDDI/au
Validity starts on first connection at the destination
NTT docomo
Exits in Japan · NTT docomo
Validity starts on first connection at the destination
NTT docomo / Rakuten Mobile / KDDI/au
Exits in Hong Kong · NTT docomo / Rakuten Mobile / KDDI/au
Validity starts on first connection at the destination
Size it by how you work, not by how many nights. Video calls and screen sharing from a hotel room push the total well above a leisure trip of the same length. If the hotel Wi-Fi is genuinely usable, keep the heavy work for the room and let the mobile line cover the moving-between-meetings part of the day.
Mostly it is the laptop doing things it never announces: system updates, cloud folder sync, backups. Mark the connection as metered in the operating system, pause automatic updates for the trip, and keep only the applications you actually need running while you are on mobile data.
Download offline maps for the entire route and save the accommodation address as plain text on the device, because there are long unserved stretches. Tell whoever is waiting for messages at home that you may be unreachable in patches, and check the schedules in advance — mountain services run far less often than city ones.
No — one profile lives on one device at a time. To get a second device online, tether it from the first, which works out the same in practice but drains the host phone's battery faster, so keep it on a charger during long sessions.