Surf with 4G/5G in Japan. Delivered instantly by email after purchase.
Traveling to several countries?
With the Asien-Bundle you surf across several countries in your region. Cheaper than individual plans.
Download the app and manage everything on the go!
Keep an eye on your data, top up anytime and install your eSIM with a single tap. Free for iOS & Android.
eSIM for Japan: activation in 3 steps
Activating your eSIM for Japan takes just a few minutes and requires no SIM card swap at all. Right after purchase you receive an email with your personal eSIM details in the form of a QR code and an activation code or link, plus instructions. It's best to install the eSIM comfortably from home; you only activate mobile data after your arrival in Japan.
How to activate the eSIM on iPhone (iOS)
- Open Settings → Cellular → Add eSIM.
- Select Use QR Code and scan the code from our email. Alternatively you can enter the activation details manually.
- Give the line a meaningful name, e.g. "BuddySIM Japan", and finish the setup.
- in Japan, activate BuddySIM under Cellular → Data Roaming and select it as the line for mobile data.
How to activate the eSIM on Android (Samsung, Pixel & Co.)
- Open Settings → Connections → SIM manager (on Google Pixel: Network & internet → SIMs).
- Tap Add eSIM and scan the QR code from our email.
- Confirm the download of the eSIM profile and wait until setup is complete.
- After your arrival in Japan, enable data roaming and select BuddySIM for mobile data.
The exact menu labels may differ slightly depending on your smartphone model and operating system version. You'll find a detailed step-by-step guide by device in our eSIM activation guide.
No second device to scan?
Only have your smartphone and can't scan? No problem! We also send you a one-click installation link and activation details for manual activation of your eSIM.
Why a BuddySIM eSIM for Japan?
Here's how BuddySIM for Japan compares to other eSIM providers and the local SIM card on site: transparent, fast and with no hidden costs.
 |
Other eSIM providers | Local SIM card | |
|---|---|---|---|
| Buy online instantly | Available instantly | Usually possible | Only on site |
| Activation only on arrival | Activation in your destination – avoids using data before arrival | Depends on provider | Manual setup |
| Fixed GB plans | Full cost control | Depends on provider | Often confusing |
| Day Pass | Often unlimited with throttling | Depends on provider | |
| Share hotspot | Often limited | Depends on plan | |
| Multi-network coverage* | Multiple networks | Not always transparent | Usually one provider |
| No Net, No Pay guarantee | |||
| Personal support | Personal | Often bot only | On site/hotline |
| Roaming costs | €0,00Prepaid, no hidden costs | Mostly prepaid | Depends on plan |
| Flexible top-ups | Flexible anytime | Depends on provider | Often complicated |
| Stress factor | Very low | Medium | High |
*Multi-network coverage: where needed, several local networks are available so you get the best possible coverage. Your device automatically connects to the strongest available signal.
eSIM prices for Japan
Compare all eSIM plans for Japan at a glance, including duration, total price and price per GB. This way you transparently find the right data plan for your trip in Japan, with no hidden costs and no contract.
| Plan | Validity | Price | Per GB |
|---|---|---|---|
| 1 GB | 7 days | €5,99 | €5,99/GB |
| 3 GB | 30 days | €10,99 | €3,66/GB |
| 5 GB | 30 days | €14,99 | €2,99/GB |
| 10 GB POPULAR | 30 days | €21,99 | €2,19/GB |
| 20 GB | 30 days | €34,99 | €1,74/GB |
| 50 GB | 30 days | €79,99 | €1,59/GB |
About the eSIM for Japan
eSIM Japan: Unlimited Data Volume for Tourists
Our eSIM Japan Data Plans
Choose your fixed data plan for Japan by GB and duration.
With the BuddySIM eSIM for Japan you're online instantly in Japan: fast mobile internet right after arrival, with no physical SIM card and no expensive roaming fees. You buy your eSIM conveniently online, receive the QR code instantly by email and activate it in just a few steps on your smartphone.
Mobile data in Japan: no roaming
Instead of hunting for a local SIM card at the airport or paying your home provider's roaming fees, with BuddySIM you simply keep using your familiar smartphone. Your existing number stays active on the physical SIM for calls and SMS, while the eSIM handles only your mobile data in Japan. So you stay connected at all times for maps, translations, bookings and social media.
Network coverage & speed in Japan
The eSIM Japan connects automatically to KDDI and offers you speeds of 4G/LTE & 5G, where available. You surf reliably in the cities and at the most important destinations in Japan, ideal for streaming, navigation and video calls. Via the personal hotspot you can also share your connection with a laptop or tablet.
Who is the eSIM for Japan worth it for?
Whether holiday, backpacking, workation or business trip: the BuddySIM eSIM for Japan is the hassle-free solution for anyone who wants to stay online in Japan. Simply pick the right data plan for your trip length and get going right away, with no contract and no hidden costs.
Activate eSIM Japan: in just a few minutes
After purchase you receive your personal QR code directly by email. Install the eSIM comfortably from home, activate the mobile data in Japan after arrival, and off you go. You'll find a detailed step-by-step guide further up on this page.
Technical specifications: eSIM for Japan
This is how much data you need in Japan
All figures are estimates. Your actual usage depends on your smartphone, your app settings and your personal usage.
The story behind BuddySIM
BuddySIM was born during my parental leave, out of real frustration. Expensive roaming fees, stressful queues at the airport with small children and a complicated hunt for SIM cards on site? It doesn't have to be like that.
A holiday is the best time of the year and should be worry-free! That's why I founded BuddySIM, so you can focus on what matters most on holiday: relaxing and spending time with your loved ones.
Rafael Gomez
Founder of BuddySIM
Money-back guarantee for Japan
100% money-back guarantee
Your satisfaction is our priority. You'll of course get your money back if:
- the eSIM has not yet been activated/used (0.00 MB)
- your device is not eSIM compatible
- your trip was cancelled
Refund within 14 days of purchase. If you had other issues and our support couldn't help you, feel free to write to us anytime as well.
No Net, No Pay guarantee
In the event of a proven, continuous network outage of more than 90 minutes in Japan, we refund you 100% of the purchase price of the affected eSIM.
Learn more →Frequently asked questions about the eSIM for Japan
Any questions about your eSIM for Japan?
Our support team is available around the clock for you, before, during and after your trip. Just write to us, we'll help you quickly and easily.
More information Show less
eSIM for Japan – instantly online & roaming-free | BuddySIM Guide
The essentials at a glance
- Instantly online in Japan: With an eSIM you're on the network the moment you arrive, with no roaming costs – no detours, no stress.
- Flexible, tailored plans: Choose exactly the data allowance and duration that suit the way you travel.
- Top network quality & fast support: Providers like BuddySIM give you access to reliable mobile networks and are on hand around the clock for any questions.
- Fully digital and eco-friendly: No plastic, no hunting for local SIM shops – everything runs via QR code.
- Cost control: Prepaid plans with no hidden fees and full transparency over your data usage.
Why an eSIM is the best choice for Japan
The eSIM for Japan is far more than a passing tech trend. It makes travelling through Tokyo, Kyoto or rural Japan more relaxed, because you're online right from the start.
- No more inserting a SIM card,
- no shop-hunting.
With a simple QR-code scan you start your internet connection – often even before you land.
Everything runs digitally and transparently, usually on a prepaid basis and with full cost control. Especially in a country with such an extensively developed mobile infrastructure, an eSIM can offer advantages in terms of coverage and network availability, for example for
- navigation,
- translations,
- social media
- or work.
An added bonus: protecting the environment. No plastic SIM cards, no packaging waste, no shipping – the entire solution is digital.
What are the benefits of the eSIM?
After your purchase you receive a QR code by email, scan it, and unlock the data connection you want. With this process you're ready to go within minutes – no fiddly little parts, no annoying adapters. On trips to Japan in particular, this saves you waiting around and searching at the airport.
Another highlight: many providers – such as BuddySIM – offer multi-network access. This lets you tap into whichever coverage is available across the different regions of Japan.
Benefits of an eSIM for Japan at a glance:
|
Benefit |
What it means for your trip |
|
Instant activation |
Online straight away – no waiting when you arrive |
|
Flexible plan choice |
Choose your data allowance & duration individually |
|
Prepaid & transparent |
No subscriptions, full cost control, no roaming |
|
Wide coverage |
KDDI, SoftBank, Docomo networks – broad coverage across many regions |
|
Eco-friendly & smart |
No plastic, no paper, no need to buy a local SIM |
Japan eSIM plans – a choice for every type of traveller
Whether it's a short break, a business trip or a longer holiday: Japan offers a huge range of eSIM plans.
The key questions are:
- How long are you staying?
- How much data do you need?
- Do you want to browse without limits?
Travel providers and services like BuddySIM have packages tailored to different kinds of trips – from 1 GB to Unlimited, from 3 to 30 days.
The plans differ in areas such as
- coverage,
- price,
- support quality
- and extra features.
Hotspot sharing, flexible top-ups and a real-time overview via app are worth their weight in gold for many travellers.
Plan types in the Japan eSIM comparison
|
Plan |
Duration |
Who it's for |
Typical providers |
|
Short-trip package |
3-7 days |
City breaks, city trips, business travel |
Ubigi, BuddySIM |
|
Unlimited plan |
7-30 days |
Heavy users, streamers, digital nomads |
fraenk, BuddySIM, ESIMJAPAN.com |
|
Regional Asia packages |
7-30 days |
Travellers touring Asia |
Saily, ESIMJAPAN.com |
|
Family or group plans |
14-30 days |
Families, multiple devices via hotspot |
BuddySIM, Japan Wireless |
Data protection and cookies: what you should know as a user
When you buy an eSIM through a European platform like BuddySIM, you automatically benefit from the EU's strict data-protection standards. The use of cookies on websites is tightly regulated in Europe. The German Telecommunications-Telemedia Data Protection Act (TTDSG, § 25) requires that non-essential cookies may only be set with the user's explicit consent.
In addition, the European Data Protection Board (EDPB) clarified the technical scope of Art. 5(3) of the ePrivacy Directive in its Guidelines 2/2023, further specifying the requirements for consent when it comes to tracking technologies.
BuddySIM relies on the well-established consent-management tool Cookiebot and draws a clear distinction between necessary, preference, statistics and marketing cookies. Necessary cookies (e.g. for the checkout process via Shopify or Cloudflare protection) work without separate consent, as they are required for the website to operate. Marketing and statistics cookies from third parties such as Google or Meta, on the other hand, are only loaded after active consent.
Since 2024, Google itself has required publishers in the EEA to implement a certified Consent Management Platform (CMP) in order to be allowed to serve personalised advertising. The fact that compliance with these rules is taken seriously is shown by the authorities' enforcement measures.
For example, in May 2023 Meta (Facebook) was hit with a record fine of 1.2 billion euros for transferring personal data to the USA without a sufficient legal basis, as confirmed by the European Data Protection Board (EDPB). This decision underlines how important it is to choose data-protection-compliant providers for online services.
Which type of plan suits you?
If you like streaming videos or frequently make video calls, an Unlimited package for 7 to 30 days can be a good option. For a quick short stay such as a city trip, affordable short packages are the way to go. If you're unsure, you can usually top up your data conveniently while on the move. Many providers also offer regional Asia plans – perfect if you're combining Japan with other countries.
Another big plus of most eSIMs: they're easy to manage and top up via an app, with no need to rescan a QR code or go through complicated processes.
Bear in mind: the question of which eSIM is best for Japan depends directly on the way you travel, your data needs and your budget. If you have high expectations of support or network quality, go for proven providers like BuddySIM.
Checklist: find the perfect eSIM for Japan in 5 steps
- Check whether your smartphone/tablet is eSIM-capable (e.g. via a compatibility list).
- Define your data needs and the duration you want.
- Compare providers in terms of coverage, price & support.
- Book the eSIM online – you usually receive a QR code straight away.
- Activate your data package as soon as you arrive – and enjoy mobile internet in Japan!
Activation & setup: how to get started with your eSIM in Japan
Activating an eSIM is straightforward and often takes less than a minute. You choose a suitable data plan, buy it online, receive an email with your QR code and scan it in your smartphone's settings.
Step-by-step guide
- Choose a data plan: Pick your plan and order it online in advance.
- Receive the QR code: Have it sent to you by email – it's best to open it on a second device.
- Set it up: In your phone's settings, select „Add mobile plan“ and scan the QR code.
- Activate: Unlock the package either right away or when you first get a signal in Japan.
- Get going: Simply browse on the best network, make calls (depending on the provider) or use a hotspot.
You manage your eSIM via an app or online portal. This lets you top up your data when needed, view usage statistics or adjust settings.
Network quality, compatibility & support – what to look out for
Japan is known for its good coverage. Many eSIM providers work with established mobile operators such as KDDI, Docomo and SoftBank. Accordingly, LTE/5G services are available in many regions – including rural areas, islands and many train routes.
An added guarantee of a comfortable trip: round-the-clock customer service. Many providers can be reached 24/7 by chat, WhatsApp or email.
BuddySIM offers a worry-free guarantee: in the event of network outages lasting more than 90 minutes, refund arrangements may apply – see the provider's terms.
BuddySIM – your eSIM for stress-free browsing in Japan
With BuddySIM you get an eSIM for Japan along with various supporting services for travellers.
- Worry-free guarantee: In the event of network outages lasting more than 90 minutes, a refund may be issued in line with the provider's terms.
- Multi-network quality: Use of different local mobile networks for the widest possible coverage.
- Prepaid without risk: No contract, full cost control and transparent prices.
- Lightning-fast activation & great instructions: From QR code to support – it's all super simple.
- App management: Top up your data, check your usage, change settings – all via app.
- Ideal for every type of traveller: Whether it's a short break, a family holiday or a business trip – BuddySIM has the right package.
- For private and business customers: Prepaid plans can offer simple cost control and better predictability.
- Hotspot sharing: Share your connection with your laptop, family and colleagues.