Japan SIM Card Unlimited Data | KDDI

Name: Japan SIM Card Unlimited Data | KDDI - TravelKon
Brand: TravelKon
SKU: JPKDDI
Rating: 5.00 (2 reviews)

(167 Reviews)

Out of stock

True Unlimited Data
4G/5G Speed
Up to 31 Days
Data only
Service End 22/11/25
Use in Japan

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.

Disable VPN and any secondary SIM/eSIM lines (for dual SIM phones)
Turn phone off, remove the SIM, insert the SIM back and turn phone on
Confirm mobile data is sourced from our SIM (i.e. the correct SIM profile is selected)
Turn data roaming on (Android: select all network)
Wait up to 10 minutes for activation to occur
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
Turn off automatic network selection and manually choose from the list below.
Restart your phone and/or turn on and off airplane mode
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.

Reviews

Customer Reviews

japan 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 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 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)

japan 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 sim card