Japan SIM Card Unlimited Data | KDDI

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Description

What’s Included?

  • True Unlimited Data
  • 4G/5G speed (up to 1Gbps)*
  • 7 – 31 days of service from activation (natural day)
  • For use in Japan
  • Nano SIM card only (standard or micro size SIM card slot will NOT fit)
  • Hotspot/Tethering enabled
    • Limits apply: 7 days – 6GB, 10 days – 9GB, 15 days – 15GB, 31 days – 30GB
  • Service ends on 22 November 2025

Thing’s to know

  • Local  KDDI Japanese SIM Card
  • No ID registration needed
  • Service days are calculated according to Japan Standard Time (GMT+9) and reset at 00:00 (midnight) each day, not based on a 24-hour period.
  • No calls or texts included (data-only eSIM)
  • Coverage on KDDI
  • Compatible with unlocked mobile devices (Galaxy Note 8, Realme, Nokia, LG K30 phones are NOT compatible)
  • Works in all unlocked devices (mobile phones & tablets devices)
  • Click here for the eSIM version

Important Notes

  • Insert the SIM card upon arrival at your destination to avoid accidental activation outside coverage countries.
  • SIM will not work on Modem/Mifi/Pocket Wifi device
  • Galaxy Note 8, Realme, Nokia and LG K30 are not compatible phones – no refunds will be provided if you use these phones.
  • Data service will end on the expiry date stated
  • Check network coverage in your intended travel areas; Coverage issues are outside our control and we do not offer refunds

Unlimited Japan KDDI Ultra Product Line

  • At TravelKon, we believe in clear and honest communication. Some sellers advertise ‘unlimited data‘ loosely. If you encounter ambiguous language about potential data slowdowns due to factors beyond their control and assurances that speeds will normalise the next day, it indicates undisclosed daily usage caps. Reducing the speed to 128Kbps without disclosure is misleading and barely enough for basic messaging!
  • Our Unlimited Japan KDDI Ultra plan truly means unlimited data with no daily data caps!
  • Ranked #1 by Opensignal in October 2024, KDDI leads Japan’s telecom market, surpassing NTT Docomo and Softbank. Known for its extensive coverage in both urban and rural areas, KDDI offers unmatched network performance, ensuring seamless connectivity across Japan’s diverse landscapes.

Troubleshooting Guide

SIM not working? Don’t stress! Follow this guide to get you up and running.

  1. Disable VPN and any secondary SIM/eSIM lines (for dual SIM phones)
  2. Turn phone off, remove the SIM, insert the SIM back and turn phone on
  3. Confirm mobile data is sourced from our SIM (i.e. the correct SIM profile is selected)
  4. Turn data roaming on (Android: select all network)
  5. Wait up to 10 minutes for activation to occur
  6. APN: uad5gn.au-net.ne.jp | Username: au@uad5gn.au-net.ne.jp | Password: au OR:
    APN: uno.au-net.ne.jp | Username: 685840734641020@uno.au-net.ne.jp | Password: KpyrR6BP (Android: select manually)
    Android Only: Authentication Type: CHAP
  7. Turn off automatic network selection and manually choose from the list below.
  8. Restart your phone and/or turn on and off airplane mode
  9. Still not working? Chat with us live, we’re here to help!

We are not affiliated with the network provider. Data allowance may change without notice; check our website for updates.

Network Operator(s) List

  • Japan [KDDI]

*Access to KDDI’s 5G network is available in designated 5G coverage areas when using a 5G-compatible device. Outside these areas, your device will switch to 4G. Download speeds on 5G can reach up to 1Gbps under optimal conditions, this is the maximum potential speed and not guaranteed. Speeds and quality depend on factors like location, device, network congestion, and coverage.

Device compatibility

Is my device eSIM compatible?

Check the compatible phone list below, then use the checker if you are unsure.

Apple eSIM compatible phones 34 listed
Apple iPhone Air
Apple iPhone 17 Pro Max
Apple iPhone 17 Pro
Apple iPhone 17
Apple iPhone 17e
Apple iPhone 16e
Apple iPhone 16 Pro Max
Apple iPhone 16 Pro
Apple iPhone 16 Plus
Apple iPhone 16
Apple iPhone 15 Pro Max
Apple iPhone 15 Pro
Apple iPhone 15 Plus
Apple iPhone 15
Apple iPhone 14 Pro Max
Apple iPhone 14 Pro
Apple iPhone 14 Plus
Apple iPhone 14
Apple iPhone SE (3rd gen, 2022)
Apple iPhone 13 Pro Max
Apple iPhone 13 Pro
Apple iPhone 13
Apple iPhone 13 mini
Apple iPhone 12 Pro Max
Apple iPhone 12 Pro
Apple iPhone 12
Apple iPhone 12 mini
Apple iPhone SE (2nd gen, 2020)
Apple iPhone 11 Pro Max
Apple iPhone 11 Pro
Apple iPhone 11
Apple iPhone XS Max
Apple iPhone XS
Apple iPhone XR
Important checks
  • Dial *#06# and confirm your device shows an EID number.
  • Your device must be carrier / network unlocked.
  • Your device must not be jailbroken (iOS) or rooted (Android).
  • Some regional models may not support eSIM even if the same phone name does.

Check device compatibility

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Reviews

Customer Reviews

Japan 5G eSIM
Christopher
Rating: 5/5
Have never used an ESIM before so was vey nervous about it activating! Wow this card is easy as downloaded in minutes ,turned in on the plane when landing and it activated straight away have been using it so far all over Japan with no issues at all ! I’m 60 and technically challenged but I am so impressed so far with this ESIM I highly recommend this product
Mon May 11 2026 22:40:18 GMT+0000 (Coordinated Universal Time)
Japan eSIM Unlimited Data | KDDI
Brooke
Rating: 5/5
Excellent service. Hasn’t missed a beat, even in outside city areas. Highly recommend.
Sat Mar 21 2026 00:57:11 GMT+0000 (Coordinated Universal Time)
Japan eSIM Unlimited Data | KDDI
Richard
Rating: 5/5
I’m very impressed. I initially bought another eSIM which I have been for the past three years for my overseas trips. I was happy with it and shared it with friends. But this year after using 1.5gb of data on the first day the high speed would drop down to 1mps which is useless. It was stated as an unlimited eSIM. I was in Japan and it was using China’s mobile network! I was very disappointed. But luckily a fellow traveller was using travelkon and showed me that it was truly unlimited with high speeds. I was happy to pay for another eSIM for the convenience and zero hassles. It was almost half the price for what I paid for the previous one. I will definitely be using travelkon again on my future trips.
Tue Mar 17 2026 13:18:27 GMT+0000 (Coordinated Universal Time)
Japan 5G eSIM
Michelle Villaruz
Rating: 5/5
It was easy to install and have very friendly and prompt response to my queries. Highly recommended.
Fri Dec 26 2025 13:34:04 GMT+0000 (Coordinated Universal Time)
Japan 5G SIM Card
Sarah Macmillan
Rating: 5/5
Has worked well with no issues.
Sat Dec 20 2025 11:53:11 GMT+0000 (Coordinated Universal Time)
Japan eSIM Unlimited Data | KDDI
Justin
Rating: 5/5
Great service with no issues or black spots at all within Japan.
Wed Nov 26 2025 00:22:47 GMT+0000 (Coordinated Universal Time)
Japan 5G SIM Card
Paul V.
Rating: 5/5
Just turn on and
Just turn on and go
Fri Oct 10 2025 22:38:43 GMT+0000 (Coordinated Universal Time)
Japan 5G eSIM
Jose Lomboy
Rating: 5/5
Holiday in Japan
Its absolutely a good desision that i purchased an esim at travelkon its hassle free as soon i arrived in Japan it activate straight away. I’ll used it again in my next asia adventure. Thanks
Sat Apr 05 2025 09:19:48 GMT+0000 (Coordinated Universal Time)
Japan 5G SIM Card
William C.
Rating: 5/5
Working well as soon as I landed. Thanks!
Tue Jun 11 2024 22:38:02 GMT+0000 (Coordinated Universal Time)
Japan 5G eSIM
Anonymous
Rating: 5/5
Great service and speed with no connectivity issues (in Tokyo, Nagano and Hakuba)
Thu Feb 01 2024 08:35:18 GMT+0000 (Coordinated Universal Time)
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