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Japan eSIM
Japan eSIM
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Features
- Use In: 🇯🇵
- Data Only: Yes
- SMS: No
- Calls: No, only through apps (VOIP)
- Compatibility: Check compatibility
Description
- This eSIM provides high-speed mobile data on supported partner networks. Actual speeds may vary depending on network coverage, congestion, location, and device capability. Activate your eSIM when you arrive at a supported destination and avoid international roaming charges from your primary carrier.
- Digital Delivery Only - Your eSIM QR code and activation instructions will be delivered via email within 15 minutes upon successful payment.
- Please ensure a valid and accurate email address is provided at checkout. DealeSIM is not responsible for delivery failure resulting from incorrect or inaccurate contact information.
Technical Specs
- Activation Deadline: Within 180 days of purchase
- IP/Data Routing: SG
- Hotspot: Yes
- Speed Reduction: No
- Supported Networks: KDDI/au 5G
- Supported Countries: Japan
Japan eSIM Guide: Coverage, Speeds & Travel Tips
This Japan eSIM connects to KDDI/au's 5G network, covering major cities nationwide — from Sapporo in the north to Okinawa in the south, including Tokyo, Osaka, and Kyoto along the way. There's no speed throttling, and hotspot tethering is included. Activate instantly and stay connected throughout your trip.
Travel Tips
- Hotspot doubles as a mobile router. This eSIM includes hotspot tethering, so you can share your connection with a laptop or second device — handy for working from a café or splitting data with a travel companion.
- Your connection may show as a Singapore IP address. This eSIM's data routes through a Singapore gateway, so some apps or websites that check your location may briefly show Singapore instead of Japan. This doesn't affect coverage, speed, or day-to-day use.
- Coverage spans the whole country, with some gaps in the mountains. KDDI/au covers major cities and towns nationwide — Sapporo and Sendai in the north, Tokyo, Osaka, and Kyoto in the center, Fukuoka and Okinawa in the south — plus the shinkansen corridors; signal can still drop in mountainous areas or remote hiking trails (e.g., parts of the Japan Alps).
- Keep your home SIM active for SMS codes. Since this is a data-only eSIM, some Japanese services and 2FA texts still expect a number that can receive SMS.
- No throttling on any plan. Every data allotment runs at full 5G speed until it's used up, so heavier days (navigation, translation apps, streaming) won't slow you down.
Frequently Asked Questions
Q: Which network does the Japan eSIM use, and where is coverage strongest?
A: This eSIM connects to KDDI/au's 5G network, which covers major cities and towns nationwide — from Sapporo in the north, through Tokyo, Osaka, and Kyoto, down to Fukuoka and Okinawa in the south — as well as the shinkansen routes connecting them.
Q: Does this eSIM come with a Japanese phone number?
A: No. This is a data-only eSIM, so it doesn't support calls or SMS. Use an app like WhatsApp or LINE for calls over data, and keep your home SIM active if you need to receive SMS verification codes.
Q: How long do I have to activate this eSIM after I buy it?
A: You have 180 days from purchase to activate it before the eSIM expires unused. Once you activate it, your plan's own validity period (e.g., 30 days) starts counting down separately.
Q: Why does my connection show a Singapore location instead of Japan?
A: This eSIM's data routes through a Singapore gateway, so apps or websites that check your location may briefly show a Singapore IP. This doesn't affect coverage, speed, or day-to-day use — it's just how the connection is routed.
Q: What happens if I run out of data before my trip ends?
A: This plan doesn't include automatic top-up. If you run out, simply purchase a new Japan eSIM plan and install it alongside your current one — no need to remove the first.