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Best Plans, Best Deals, Best Coverage
– No Worries, Just Enjoy Japan!

At Best eSIM Japan, we value the Japanese spirit of “Omotenashi”—a deep-rooted culture of hospitality. Our mission is to ensure that every traveler enjoys their journey through Japan with safety and confidence. Partnering with Japan’s most awarded network, au, we provide reliable and affordable internet—Enjoy Japan without limits!

International

orders welcome

Affordable

local Price
&Tax Free

Easy

online process

English support

available

3 Reasons to Choose

Best eSIM Japan

5G/4G Unlimited Data + 3-15 GB

for Additional Devices

Enjoy truly unlimited 5G/4G data on your main device without speed restrictions, unlike some providers that apply sever limits under certain conditions. Plus, you get an additional 3-15GB of data that can be shared with a secondary device, ensuring seamless connectivity for all your needs―sharing with your traveling friends or families, and even for business.

99.9% Nationwide Coverage

— even at the top of Mt. Fuji!

Our eSIM provides 99.9% coverage across Japan, including hard-to-reach spots like the top of Mt. Fuji, subway systems, and even high-speed Shinkansen trains. So whether you’re in a bustling city or exploring scenic landscapes, enjoy uninterrupted connectivity at all times.

Japan's Most Awarded Network in 2025 - au

Our network provider au has won 13 sections out of 15, including Reliability Experience, surpassing three other carriers including NTT Docomo, Softbank and Rakuten.

Best Plans

Flexible plans for every traveler — Unlimited 5G/4G on your main device, plus 3–15 GB of shareable data for others.

Unlimited Internet
without speed restriction

+

3-15 GB Shareable data
for another devices

Enjoy all of these benefits

Unlimited at

Max Speed

Nationwide

Coverage

Shareable

Data

Free au

WiFi Zone

How It Works

Purchase

Online

Choose your plan and complete your purchase.

Receive

Your eSIM

Instantly receive a QR code via email.

Activate

Scan the QR code, follow a few simple steps, and start using unlimited data in Japan.

Best Deals

Still Paying More at the Airport?

Get connected before you arrive and enjoy a smooth, stress-free trip!
Order Now and Save Big!

Narita Airport vs Best eSIM Japan

4 Days

¥5,610

7 Days

¥7,700

10 Days

¥8,250

15 Days

¥8,800

Best
eSIM JAPAN

¥2,750

51%
OFF

¥4,000​

49%
OFF

¥5,500​

34%
OFF

¥7,500

15%
OFF

Compare with

Other Providers

Plan

Speed

Coverage

Price

Best
eSIM Japan

Truly unlimited data.

Fast and reliable.

Excellent coverage,
even

in subways, on
Shinkansen
trains,
and at Mt. Fuji.

Affordable and
cost-effective.

Other Providers

Unlimited plans with hidden
limits or capped data.

Average speed; becomes
nearly unusable after hitting
data limits.

Generally good in standard
locations, but unreliable in
subways or remote areas.

May be cheaper, but with
major performance and
usability limitations.

Why eSIM is the Best Option

Options

SIM Card

Pocket Wi-Fi

Roaming

Advantages

● Direct access to
mobile
　 networks.

● Can connect multiple
　 devices.

● No need for additional
　 devices or setup.

Disadvantages

● Risk of losing the original
　 SIM card.

● Inconvenient SIM swapping.

● Requires carrying an
　 additional device.

● Complicated pick-up and
　 return processes.

● Expensive.

● Limited coverage in certain
　 areas.

● Slower speeds compared to
　 local networks.

Advantages

Disadvantages

SIM Card

● Direct access to mobile
networks.

● Risk of losing the original
　 SIM card.

● Inconvenient SIM
　swapping.

Pocket Wi-Fi

● Can connect multiple
　 devices.

● Requires carrying an
　 additional device.

● Complicated pick-up and
　 return processes.

Roaming

● No need for additional
　 devices or setup.

● Expensive.

● Limited coverage in
　 certain areas.

● Slower speeds compared
　 to local networks.

All the Benefits,
None of the Drawbacks

eSIM

  • Direct access to mobile
    networks.
  • Can connect to multiple
    devices by mobile hotspot.
  • Cost-effective with reliable
    access to local networks.
  • Keeps your original mobile
    number (including SMS).
  • No risk of losing or needing
    to swap physical SIM card.
  • Simple QR code setup
    and removal.

Best Coverage

With au’s 99.9% network coverage across Japan, Best eSIM Japan ensures that every traveler using an eSIM stays connected—from city stations to mountain peaks and remote islands. Discover how au’s powerful 5G/4G network supports every journey.

See More

FAQ

How can I verify if my device is compatible?

Ensure your device is unlocked and supports eSIM functionality. You can check if your phone is unlocked by following the guide provided here. For a list of compatible models, refer to our compatibility list. Alternatively, dial *#06# on your device to display your IMEI or MEID number.

Yes, you can use your device as a mobile hotspot to share data. The amount of data available for sharing depends on the duration of your plan:

3 or 4 days: 3GB

5 to 7 days: 6GB

8 to 10 days: 9GB

11 to 15 days: 15GB

Your data plan activates as soon as your device connects to a local network. You can install the eSIM in advance by scanning the provided QR code. Since this plan is directly provided by a Japanese carrier (au by KDDI), there’s no need to enable data roaming.
Yes, this plan offers access to 5G networks, allowing you to experience high-speed internet where 5G coverage is available.
The plan’s duration is based on Japanese Standard Time (JST). A day is counted from 00:00 to 23:59 JST. For example, if you activate the eSIM at 23:00 JST, it will be considered as one day when the clock reaches 00:00 JST.
The plan’s duration is based on Japanese Standard Time (JST). A day is counted from 00:00 to 23:59 JST. For example, if you activate the eSIM at 23:00 JST, it will be considered as one day when the clock reaches 00:00 JST.
Once the plan expires, it cannot be extended or renewed. If you need additional data or a longer duration, you’ll need to purchase a new eSIM plan.
If you experience any problems with your eSIM, please contact our customer support team for assistance. They are available to help resolve any issues you may have.
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