Japan is one of the easiest countries to travel with an eSIM. The networks are reliable, activation is straightforward, and most modern phones support it. The hard part is picking the right plan — not because the options are bad, but because the marketing around them is confusing.
Here's what I actually know after going through every major provider's Japan lineup.
First: check your phone
Before anything else. eSIM works on iPhone XS (2018) and later, Pixel 3 and later, Galaxy S20 FE and later. The exception is phones bought in mainland China — many of those have eSIM disabled at the firmware level, regardless of model. If you bought your phone in China, check the settings before you travel, not at the airport.
On iPhone: Settings → Cellular → Add eSIM. If that option exists, you're good. On Android, it varies by manufacturer but it's usually under Network or SIM settings.
What the networks actually look like
Japan has three major carriers: NTT Docomo, KDDI (au), and SoftBank. Most travel eSIMs use KDDI and SoftBank — Driftvoy included.
For cities and the Shinkansen corridor (Tokyo–Osaka–Fukuoka), KDDI and SoftBank are fine. 5G is available in major stations and city centers. On the Shinkansen itself, coverage is continuous between stops — you'll drop signal in tunnels (some are long), but it reconnects as soon as you exit.
Where Docomo has an advantage: remote mountain areas and smaller islands. If you're going to, say, the Ogasawara Islands or deep into the Japanese Alps, Docomo's rural coverage is measurably better. For everywhere else most travelers go — Tokyo, Kyoto, Osaka, Hiroshima, Sapporo, Naha — KDDI and SoftBank are equivalent.
The plans on the market
Here's where things actually stand in 2026:
1 GB / 7 days: Saily is at $3.99. Driftvoy is at $4.99. Airalo is around $4.50. For a week-long trip where you're mostly navigating and messaging, 1 GB is tight but workable if you're on WiFi at your accommodation.
5 GB / 30 days: Driftvoy $9.99, Airalo ~$20, Saily ~$10.99. Saily is close. Airalo is significantly more expensive here — I genuinely don't know what justifies the premium.
10 GB / 30 days: Driftvoy $14.99, Airalo $18.00, Saily $17.99. The most common plan for a 10–14 day trip. Driftvoy is cheaper on this SKU, but Airalo and Saily are established brands with years of reviews, so you're paying a brand premium.
20 GB / 30 days: Driftvoy $19.99, Saily ~$22–24, Nomad ~$23. Good for heavy users or anyone planning to hotspot a laptop.
Holafly: Unlimited plans starting around $19 for 5 days, up to $99 for 90 days. Their unlimited plans throttle after a daily threshold — they call it a Fair Use Policy. If you hit it, you're looking at 128–512 kbps for the rest of the day. That's enough for messaging but not for maps or video. If you want "never think about data," Holafly works. If you want reliable speed, I'd pick a metered plan.
Throttling: what it actually means
Most "unlimited" plans in Japan cap daily high-speed data at 1–3 GB, then throttle to 1 Mbps or slower. At 1 Mbps:
- Google Maps: works, but slow to load tiles
- WhatsApp messages and voice: fine
- Instagram: loading, but sluggish
- Video calls (Zoom, FaceTime): choppy, sometimes unusable
- Hotspot for laptop work: effectively useless
If you're going to hotspot a laptop or stream video, throttled unlimited is a bad deal. A 10 GB full-speed plan will serve you better than a "unlimited" plan that caps at 3 GB/day high-speed.
What I'd actually recommend
Short trip (5–7 days), light use: 1 GB / 7 days. Any provider. Don't overthink it.
Standard trip (7–14 days), normal use: 5 GB or 10 GB / 30 days. Driftvoy, Airalo, or Saily. Saily is competitive on price; Airalo has the most reviews; Driftvoy is newer but cheaper on 10 GB.
Long stay or heavy user: 20 GB / 30 days. Driftvoy or Saily.
"I just want unlimited and don't care about throttling": Holafly. Their plans work — they just throttle after the FUP threshold.
Installation
Install before you fly. Not at the airport, not on the plane — at home, on WiFi, a day or two before departure.
On iPhone: Settings → Cellular → Add eSIM → Use QR Code. Scan the QR from your purchase confirmation email. Label the line "Japan" and set it as your Data line. Your home SIM keeps doing calls and texts.
On Android (Pixel): Settings → Network & internet → SIMs → Add more. Same process.
When you land: turn off airplane mode. The eSIM connects to a supported network automatically. No app, no re-scan, no waiting.
One thing most guides don't mention
If you're on a plan that supports top-ups, do it before you run out — not after. Once your data hits zero, you're offline, which means you can't access your account to top up without WiFi. Add data when you're at 15–20% remaining.
Driftvoy is launching in September 2026. We're adding Japan eSIM plans from $4.99. Join the waitlist for 10% off your first plan.