Best eSIM for Japan
Instantly compare and calculate the best local network deals for your trip to Japan.
Find the perfect plan for Japan
Staying connected in Japan
What the coverage maps do not tell you, and what you will actually use the data for.
Where the signal actually drops
Japan has some of the densest urban coverage anywhere: NTT Docomo, KDDI and SoftBank all run deep into the subway network, so you keep signal on most underground lines in Tokyo and Osaka. The gaps are rural and mountainous. Expect signal to drop in the Japanese Alps, on hiking routes around Kamikochi and Koya-san, in parts of rural Hokkaido, and intermittently in the long tunnels on Shinkansen routes. Coverage returns quickly in any town large enough to have a station.
What you will use your phone for here
Japan runs on the phone screen more than almost anywhere: QR codes for payment (PayPay and its rivals), IC card top-ups, restaurant ordering from a table QR, and museum and temple tickets held in a wallet app. Google Maps transit directions are close to essential, since the rail network is too complex to navigate on instinct, and live train times change with delays. Translation by camera is the other constant, because menus and station signage outside the main hubs are frequently Japanese-only.
Before you go
Free public WiFi is much rarer and more fragmented than visitors expect, and often requires an email registration flow per network, so planning to survive on cafe WiFi does not work well here. Voice calls over a data-only eSIM will not work for restaurant reservations, which many smaller places still require by phone.
How much data you will actually need
Heavier than average, mostly because of constant maps and translation rather than streaming. Two to three gigabytes a week is a realistic floor for a city trip, and more if you photograph a lot and back up as you go.
Japan eSIM plans compared
| Provider | Data | Validity | Price (USD) | Hotspot | Networks | Buy |
|---|---|---|---|---|---|---|
| Saily | 1 GB | 7 days | $3.99 | ✅ | Multiple networks | View deal |
| Airalo | 1 GB | 3 days | $4.00 | ✅ | SoftBank, KDDI | View deal |
| Nomad | 1 GB | 7 days | $4.00 | ✅ | KDDI au, SoftBank | View deal |
| Ubigi | 1 GB | 30 days | $4.00 | ✅ | NTT Docomo | View deal |
| aloSIM | 1 GB | 7 days | $4.50 | ✅ | KDDI | View deal |
| Maya Mobile | Unlimited (fast up to 5GB/day) | 3 days | $9.99 | ✅ | Multiple networks | View deal |
| Nomad | 5 GB | 30 days | $10.00 | ✅ | KDDI au, SoftBank | View deal |
| Ubigi | 5 GB | 15 days | $10.00 | ✅ | NTT Docomo | View deal |
| Saily | 5 GB | 30 days | $10.99 | ✅ | Multiple networks | View deal |
| Airalo | 5 GB | 30 days | $11.00 | ✅ | SoftBank, KDDI | View deal |
| aloSIM | 5 GB | 30 days | $11.00 | ✅ | KDDI | View deal |
| Holafly | Unlimited | 3 days | $11.90 | ✅ | KDDI, SoftBank | View deal |
| Nomad | 10 GB | 30 days | $16.00 | ✅ | KDDI au, SoftBank | View deal |
| Ubigi | 10 GB | 30 days | $16.50 | ✅ | NTT Docomo | View deal |
| Saily | 10 GB | 30 days | $17.99 | ✅ | Multiple networks | View deal |
| Airalo | 10 GB | 30 days | $18.00 | ✅ | SoftBank, KDDI | View deal |
| aloSIM | 10 GB | 30 days | $18.00 | ✅ | KDDI | View deal |
| Maya Mobile | Unlimited (fast up to 5GB/day) | 7 days | $19.99 | ✅ | Multiple networks | View deal |
| Nomad | Unlimited (fast up to 2GB/day) | 7 days | $25.00 | ✅ | KDDI au, SoftBank | View deal |
| Ubigi | Unlimited (fast up to 5GB/day) | 8 days | $25.00 | ✅ | NTT Docomo | View deal |
| Airalo | Unlimited (fast up to 3GB/day) | 7 days | $27.00 | ✅ | SoftBank, KDDI | View deal |
| aloSIM | Unlimited (fast up to 3GB/day) | 7 days | $27.00 | ✅ | KDDI | View deal |
| Holafly | Unlimited | 7 days | $27.50 | ✅ | KDDI, SoftBank | View deal |
| Maya Mobile | Unlimited (fast up to 5GB/day) | 14 days | $27.99 | ✅ | Multiple networks | View deal |
| Saily | Unlimited (fast up to 5GB/day) | 7 days | $28.99 | ✅ | Multiple networks | View deal |
| Maya Mobile | Unlimited (fast up to 5GB/day) | 30 days | $49.99 | ✅ | Multiple networks | View deal |
| Holafly | Unlimited | 15 days | $50.50 | ✅ | KDDI, SoftBank | View deal |
| Holafly | Unlimited | 30 days | $73.90 | ✅ | KDDI, SoftBank | View deal |
Why use an eSIM in Japan?
Using an eSIM is the easiest way to get mobile data when you land. Avoid expensive roaming charges and the hassle of finding a local SIM card. Simply buy online, scan a QR code, and you're connected.
How we picked the best plans
We analyze plans based on price per GB, network quality, and hotspot capabilities. Our calculator above helps you find the plan that matches your exact travel dates and data needs, ensuring you don't overpay for data you won't use.
Japan eSIM FAQ
What is the cheapest eSIM for Japan?
Right now the cheapest plan we track is Saily at $3.99 for 1GB over 7 days.
Are there unlimited data eSIMs for Japan?
Yes. Maya Mobile ($9.99 / 3 days), Holafly ($11.90 / 3 days), Maya Mobile ($19.99 / 7 days), Nomad ($25.00 / 7 days), Ubigi ($25.00 / 8 days), Airalo ($27.00 / 7 days), aloSIM ($27.00 / 7 days), Holafly ($27.50 / 7 days), Maya Mobile ($27.99 / 14 days), Saily ($28.99 / 7 days), Maya Mobile ($49.99 / 30 days), Holafly ($50.50 / 15 days), Holafly ($73.90 / 30 days) offer unlimited plans here. Check the fair-use policy: speeds are often reduced after a daily high-speed allowance.
Can I share my eSIM data via hotspot in Japan?
28 of the 28 plans we track allow hotspot sharing, including Saily and Airalo and Nomad and Ubigi and aloSIM and Maya Mobile and Holafly.
Which networks will my eSIM use in Japan?
The plans we track connect to Multiple networks, SoftBank, KDDI, KDDI au, NTT Docomo.
Where will I lose signal in Japan?
Japan has some of the densest urban coverage anywhere: NTT Docomo, KDDI and SoftBank all run deep into the subway network, so you keep signal on most underground lines in Tokyo and Osaka. The gaps are rural and mountainous. Expect signal to drop in the Japanese Alps, on hiking routes around Kamikochi and Koya-san, in parts of rural Hokkaido, and intermittently in the long tunnels on Shinkansen routes. Coverage returns quickly in any town large enough to have a station.
How much data do I need for Japan?
Heavier than average, mostly because of constant maps and translation rather than streaming. Two to three gigabytes a week is a realistic floor for a city trip, and more if you photograph a lot and back up as you go.