The ByteSIM Japan KDDI eSIM includes unlimited data on your phone, with no daily cap or fair-use slowdown. Actual 5G speeds depend on coverage, your device and network conditions.

This Japan eSIM uses a local KDDI au line with a Japanese IP address. iPhones display au; some Android phones display KDDI - au.

Your data is routed locally in Japan. Check your destinations on the official au coverage map.

Yes. Hotspot has a separate allowance; data on your phone stays unlimited. The table shows the total hotspot data for each listed plan, not a daily allowance.

Yes. You can use free au Wi-Fi at participating locations in Japan. Find nearby locations on the official au Wi-Fi spot map and follow the hotspot’s connection instructions.

This Japan KDDI eSIM is data-only: no phone number, calls or SMS are included. You can use WhatsApp and other internet-based calling and messaging apps over mobile data.

An eSIM-compatible, carrier-unlocked phone. No ID or passport registration is required for this plan. Check your exact model and purchase region on the compatible device list.

Activate your Japan KDDI eSIM within 180 days of purchase. If you miss this deadline, the eSIM expires and can no longer connect to the network.

Your plan starts when the eSIM first connects to au in Japan, not when you install it. Days end at midnight Japan time, rather than running in 24-hour blocks.

For example, connecting at 10 pm uses the first day by midnight.

No. The ByteSIM Japan KDDI eSIM is a local line and does not need data roaming.

This KDDI eSIM cannot be renewed or extended. If you need more days, purchase a new eSIM.

No. Once installed, this eSIM is tied to that device. It cannot be transferred to another phone or reinstalled after deletion.

Eligible unused eSIMs may qualify for a full refund within 180 days of purchase. Eligibility depends on installation, activation and usage. For connection issues, contact support while the plan is valid so the team can troubleshoot. See the Refund Policy.