Japan SIM Card Unlimited Data | KDDI

What’s Included?

• True Unlimited Data
• 4G/5G speed (up to 871Mbps)*
• 7 – 31 days of service from activation (natural day)
• For use in Japan
• Hotspot/Tethering enabled
  • Limits apply: 7 days – 6GB, 10 days – 9GB, 15 days – 15GB, 31 days – 30GB
• Service ends on 17 June 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
• Works in all unlocked devices (mobile phones & tablets devices)
• Click here for the eSIM version

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: [email protected] | Password: au OR:
   APN: uno.au-net.ne.jp | Username: [email protected] | 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 857Mbps 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.