Tokyo is about the easiest place in the world to use a travel eSIM. Coverage is dense, 5G is widely available, and you'll rarely think about signal — right up until you're underground or in a Shinkansen tunnel. Here's what coverage really looks like, and how to choose a plan that doesn't slow you down halfway through the trip.
The networks in Tokyo
Japan has three major carriers — NTT Docomo, KDDI (au), and SoftBank. Most travel eSIMs, Driftvoy included, route over KDDI and SoftBank. In Tokyo that's an easy call: both have excellent metro-area coverage, and 5G is available across major stations, business districts, and city centers — Shinjuku, Shibuya, Marunouchi, Ginza, the areas you'll actually be in.
The one place Docomo has a measurable edge is deep-rural and remote-island coverage. For Tokyo and day trips to Yokohama, Kamakura, Nikko, or Hakone, KDDI and SoftBank are equivalent and entirely reliable.
Underground and on the Shinkansen
Two situations are worth setting expectations on:
- The subway. Tokyo Metro and Toei stations and platforms have coverage; long tunnel stretches between stations can drop. In practice you load directions on the platform and they hold fine until the next stop.
- The Shinkansen. Coverage is continuous between stops along the Tokyo–Osaka–Fukuoka corridor. You'll lose signal inside the longer tunnels and pick it straight back up on the other side. Download anything you truly need (a map, a confirmation) before a long tunnel run and you won't notice.
Neither of these is specific to travel eSIMs — it's how the physical network behaves for everyone, locals included.
Why "full-speed" matters more than "unlimited" in a city
Tokyo is where throttling bites hardest, because you lean on data constantly: live train routing, translating menus and signs, looking up the next place. Many "unlimited" plans cap high-speed data at a daily threshold and then drop you to around 1 Mbps. At that speed maps crawl and translation stalls — exactly when you need them.
Driftvoy plans run at full carrier speed until your total data is used, with no daily cap and no throttle step. You buy enough data for the trip, and it stays fast the whole way.
Which plan for a Tokyo trip
City trips are navigation- and social-heavy but not usually huge on raw volume, unless you're hotspotting:
- Long weekend, light use: Japan 5 GB / 30 Days — $9.99.
- A week in the city (most people): Japan 10 GB / 30 Days — $14.99 — our "Best Choice," with headroom for maps, social, and photo sharing.
- Two weeks, heavy social, or hotspotting a laptop: Japan 20 GB / 30 Days — $19.99.
Not sure how those numbers map to your actual habits? We broke it down in how much data you really need in Japan.
One practical tip: turn off photo backup over cellular before you fly. A week of Tokyo street photography backing up to the cloud over mobile data is how a 5 GB plan disappears in three days.
Driftvoy is launching in September 2026 with full-speed Japan eSIM plans from $4.99 — no throttling, no daily caps. Join the waitlist for 10% off your first plan.