Best eSIM Japan 2026: BuddySIM, Airalo, Saily, Holafly & Nomad Compared
Japan is one of the most popular long-haul destinations in 2026, and without mobile internet things get complicated quickly: timetables, translation and maps all run on your smartphone. Roaming on a German contract quickly costs several euros a day in Japan. A travel eSIM is the cheaper and simpler solution. On 8 October 2026 we compared the Japan plans of seven providers.
Short answer: which eSIM is best for Japan?
If price per GB is all that matters, Nomad, Saily or Airalo are the cheapest. If you want unlimited data, Saily, Yesim and Holafly offer unlimited plans. We recommend BuddySIM for travellers who value two networks (KDDI and NTT Docomo), German-speaking support via WhatsApp and the No-Net-No-Pay guarantee.
Service comparison: eSIM Japan 2026 with 7 providers
Besides price, four things decide how relaxed your trip is: when the validity starts, what happens if the network fails, how you reach support and whether you can top up data. Details per the providers' terms and help centres, checked on 8 October 2026.
| Provider | Validity starts | Refund for network problems | Support | Top up the same eSIM | Unlimited |
|---|---|---|---|---|---|
| BuddySIM | usually when you connect at your destination | 100 % for a documented network outage over 90 min (No-Net-No-Pay) | WhatsApp, phone, email, German-speaking | yes, in the app | no (Japan) |
| Airalo | mostly at first connection at the destination | yes, if Airalo cannot fix it within 10 days | chat, WhatsApp, email, 24/7, multilingual | yes | yes |
| Saily | on arrival (at the latest 180 days after purchase) | after activation only case by case | chat (in the app), email, 24/7 | yes | yes |
| Holafly | when data roaming is switched on at the destination | yes, full or partial, report it during the trip | chat, WhatsApp, email, 24/7 | no, a new eSIM is needed | yes |
| Nomad | at first connection at the destination (at the latest day 60) | after activation only partial, for a verified fault | chat, email, 24/7 | for some plans | yes |
| Ubigi | on arrival at the destination | only if no data has been used | contact form, chat, 24/7 | yes | yes |
| Yesim | at purchase (optional activate later) | no guarantee for network problems stated | chat, email, 24/7 | yes, via account balance | yes |
Price comparison: eSIM Japan 2026 with 7 providers
Prices checked on 8 October 2026. All prices in euros, as shown on the providers' German websites (including promotional prices running at the time). Subscriptions, annual plans and first-purchase discounts are not included. Sources are listed below the table.
| Provider | Cheapest package | 10 GB | 20 GB | Price per GB (10 GB) | Networks in Japan | Hotspot | Unlimited 7 days |
|---|---|---|---|---|---|---|---|
| BuddySIM | 1 GB / 7 d: €4.99 | €21.99 (30 d) | €34.99 (30 d) | €2.20 | KDDI, NTT Docomo | yes | not offered |
| Airalo | 1 GB / 3 d: €4.00 | €16.50 (30 d) | €23.00 (30 d) | €1.65 | Softbank, KDDI | yes | €24.50 |
| Saily | 1 GB / 7 d: €3.49 | €15.99 (30 d) | €21.99 (30 d) | €1.60 | KDDI, SoftBank | yes | €23.99 |
| Holafly | Unlimited 1 day: €3.79 | not offered | not offered | – | KDDI, Softbank | yes, max. 1 GB per day | €25.50 |
| Nomad | 1 GB / 7 d: €3.56 | €14.22 (30 d) | €20.44 (30 d) | €1.42 | KDDI au, SoftBank | yes | €22.22 |
| Ubigi | 1 GB / 3 d: €3.50 | €16.50 (30 d) | not offered | €1.65 | KDDI, NTT Docomo | yes | not offered |
| Yesim | 1 GB / 30 d: €3.70 | €16.00 (30 d) | €24.80 (30 d) | €1.60 | KDDI | yes | €24.50 |
Sources (retrieved on 8 October 2026): Airalo, Saily, Holafly, Nomad, Ubigi, Yesim. Network details as stated by the provider; BuddySIM per our supplier's operator catalogue.
Best eSIM Japan by data volume
Best eSIM Japan with 1 GB
The cheapest is Saily at €3.49 for 7 days (€3.49 per GB). BuddySIM costs €4.99 for 7 days.
| Provider | Price | Validity | Price per GB |
|---|---|---|---|
| Saily | €3.49 | 7 days | €3.49 |
| Ubigi | €3.50 | 3 days | €3.50 |
| Nomad | €3.56 | 7 days | €3.56 |
| Yesim | €3.70 | 30 days | €3.70 |
| Airalo | €4.00 | 3 days | €4.00 |
| BuddySIM | €4.99 | 7 days | €4.99 |
Best eSIM Japan with 3 GB
The cheapest is Nomad at €6.22 for 30 days (€2.07 per GB). BuddySIM costs €10.99 for 30 days.
| Provider | Price | Validity | Price per GB |
|---|---|---|---|
| Nomad | €6.22 | 30 days | €2.07 |
| Saily | €6.99 | 30 days | €2.33 |
| Airalo | €7.50 | 7 days | €2.50 |
| BuddySIM | €10.99 | 30 days | €3.66 |
Best eSIM Japan with 5 GB
The cheapest is Yesim at €8.80 for 30 days (€1.76 per GB). BuddySIM costs €14.99 for 30 days.
| Provider | Price | Validity | Price per GB |
|---|---|---|---|
| Yesim | €8.80 | 30 days | €1.76 |
| Nomad | €8.89 | 30 days | €1.78 |
| Saily | €9.99 | 30 days | €2.00 |
| Ubigi | €10.00 | 15 days | €2.00 |
| Airalo | €10.50 | 30 days | €2.10 |
| BuddySIM | €14.99 | 30 days | €3.00 |
Best eSIM Japan with 10 GB
The cheapest is Nomad at €14.22 for 30 days (€1.42 per GB). BuddySIM costs €21.99 for 30 days.
| Provider | Price | Validity | Price per GB |
|---|---|---|---|
| Nomad | €14.22 | 30 days | €1.42 |
| Saily | €15.99 | 30 days | €1.60 |
| Yesim | €16.00 | 30 days | €1.60 |
| Airalo | €16.50 | 30 days | €1.65 |
| Ubigi | €16.50 | 30 days | €1.65 |
| BuddySIM | €21.99 | 30 days | €2.20 |
Best eSIM Japan with 20 GB
The cheapest is Nomad at €20.44 for 30 days (€1.02 per GB). BuddySIM costs €34.99 for 30 days.
| Provider | Price | Validity | Price per GB |
|---|---|---|---|
| Nomad | €20.44 | 30 days | €1.02 |
| Saily | €21.99 | 30 days | €1.10 |
| Airalo | €23.00 | 30 days | €1.15 |
| Yesim | €24.80 | 30 days | €1.24 |
| BuddySIM | €34.99 | 30 days | €1.75 |
Best eSIM Japan with 50 GB
The cheapest is Nomad at €31.11 for 30 days (€0.62 per GB). BuddySIM costs €69.99 for 30 days.
| Provider | Price | Validity | Price per GB |
|---|---|---|---|
| Nomad | €31.11 | 30 days | €0.62 |
| Ubigi | €55.00 | 30 days | €1.10 |
| BuddySIM | €69.99 | 30 days | €1.40 |
Best eSIM Japan by trip length
Best eSIM Japan for 1 week
For 1 week, 3 to 5 GB is enough for most travellers if maps and messaging are the priority. Unlimited data for 7 days starts at €22.22 with Nomad, followed by Saily (€23.99).
Best eSIM Japan for 2 weeks
For 2 weeks, 5 to 10 GB is enough for most travellers if maps and messaging are the priority. Unlimited data for 14 days starts at €34.56 with Yesim, followed by Nomad (€36.44).
Best eSIM Japan for 30 days
For 30 days, 10 to 20 GB is enough for most travellers if maps and messaging are the priority. Unlimited data for 30 days starts at €55.00 with Yesim, followed by Airalo (€63.00).
Best eSIM Japan by type of trip
Best eSIM Japan for a round trip by Shinkansen
On a two to three week round trip from Tokyo via Kyoto to Hiroshima, navigation, translation and timetable apps run every day. 10 to 20 GB is realistic. Many trains and stations in Japan have Wi-Fi, but in the countryside the eSIM is the more reliable connection.
Best eSIM Japan for a city break in Tokyo
For one week in Tokyo, 3 to 5 GB is enough if you save maps offline. If you share lots of photos and videos, take 10 GB.
Which network is best in Japan?
Japan has four mobile networks: NTT Docomo, KDDI (au), SoftBank and Rakuten Mobile. Docomo, KDDI and SoftBank also cover rural areas and the Shinkansen lines well. Travel eSIMs almost always use one or two of these three networks.
| Provider | Networks used (per provider) |
|---|---|
| BuddySIM | KDDI, NTT Docomo |
| Airalo | Softbank, KDDI |
| Saily | KDDI, SoftBank |
| Holafly | KDDI, Softbank |
| Nomad | KDDI au, SoftBank |
| Ubigi | KDDI, NTT Docomo |
| Yesim | KDDI |
Who BuddySIM is not the best choice for
- If price per GB is all that matters: 10 GB for Japan costs €14.22 (30 days) with Nomad, and €21.99 with BuddySIM. 5 of the 6 providers compared are cheaper at 10 GB.
- If you want unlimited data: BuddySIM does not yet offer a Day Pass for Japan. Unlimited for 7 days is available from Nomad, for example, starting at €22.22.
- If you need a lot of data: 50 GB costs €31.11 with Nomad; BuddySIM charges €69.99 (30 days).
What speaks for BuddySIM for Japan
- No-Net-No-Pay guarantee: if there is a documented network outage of more than 90 consecutive minutes at your destination, we refund 100 % of the purchase price (terms).
- Activation at your destination: the validity usually starts when you connect to a network in Japan, not at purchase.
- German-speaking support: via WhatsApp, phone and email.
- Networks: KDDI, NTT Docomo.
What is a Japan eSIM and how does it work?
An eSIM is a digital SIM card that you load onto your smartphone via QR code. You keep your home SIM for calls and texts and use the eSIM for mobile data in Japan. Almost all iPhones from the XS, Google Pixel from model 3 and Samsung Galaxy from the S20 series support eSIM.
How to install your Japan eSIM
- Check that your smartphone supports eSIM and is not carrier-locked.
- Buy the right data package and open the QR code from the email.
- Scan the QR code under Settings, Mobile data, Add eSIM, ideally at home over Wi-Fi.
- In Japan, switch mobile data to the eSIM and turn on data roaming for this eSIM.
Frequently asked questions about eSIMs for Japan
Which eSIM is best for Japan?
It depends on what matters to you. On price per GB alone, providers such as Nomad, Saily and Airalo come out ahead (prices checked on 8 October 2026, see table). BuddySIM uses the KDDI and NTT Docomo networks and offers German-speaking support via WhatsApp and the No-Net-No-Pay guarantee.
Which network does the BuddySIM eSIM use in Japan?
The BuddySIM eSIM for Japan connects to the KDDI (au) and NTT Docomo networks. Your smartphone automatically connects to the stronger of the two.
How much data do I need for two weeks in Japan?
For maps, translation, timetable apps and messaging, 5 to 10 GB is enough for two weeks for most travellers. If you stream a lot or share a hotspot, plan for 20 GB.
Can I use a hotspot with the eSIM in Japan?
Yes, hotspot (tethering) is included with BuddySIM. Airalo, Saily, Nomad, Ubigi and Yesim also allow hotspot according to their own information; Holafly limits it to 1 GB per day.
Does an eSIM work on the Shinkansen and in the countryside?
Yes, KDDI and NTT Docomo cover the Shinkansen lines and most rural regions. In tunnels and remote mountain valleys the connection may drop briefly.
When should I install the Japan eSIM?
Ideally install the eSIM at home over Wi-Fi. With BuddySIM, the validity usually only starts when you connect to a network in Japan.
Conclusion: which Japan eSIM is worth it in 2026?
For the lowest price per GB, Nomad, Saily and Airalo are the first choice. For unlimited data, take a look at Saily, Yesim and Holafly. BuddySIM is the right choice if network quality with KDDI and NTT Docomo, German-speaking support and the No-Net-No-Pay guarantee matter more to you than the last euro.
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