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First 100 users who click the link get a free 4-day unlimited data eSIM for Japan
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If you’re planning a trip to Japan this winter and worried about how you’ll stay connected, it’s time to forget hunting for a SIM card at the airport or relying on spotty WiFi.
With ByteSim, you can have a simple alternative with its Japan 5G ultra unlimited eSIM by KDDI, one of the country’s strongest networks. Just in time for the holiday season, ByteSim is running a special Christmas offer exclusively for TechRadar readers.
Today's best ByteSim deal for Japan
FreeGet your free 4-day Japan 5G ultra unlimited eSIM
This winter, ByteSim is giving out 100 free units of its 4-day Japan 5G ultra unlimited eSIM by KDDI, valued at $16 each. To get one for yourself, apply the promo code TRGIFT when you check out. The deal is limited to one free eSIM per person and will be available while supplies last.
For travelers planning longer stays or future visits, ByteSim is also offering an ongoing discount with the code TECHRADAR15. Entering this at checkout gives you 15% off your first purchase of any Japan 5G ultra unlimited eSIM plan. The discount is going until April 30, 2026.
View DealWhy we recommend ByteSim for Japan travel
Founded in 2021, ByteSim has quickly risen as one of the most renowned eSIM providers, covering 200+ locations globally.
In our review, ByteSim got extra points for its wide coverage, flexible plans, user-friendly app, and reliable performance, especially in places with sturdy 5G infrastructure (like Japan).
The eSIM connects to KDDI, one of Japan’s most prominent mobile networks, providing you with superior coverage and top speeds across major cities like Tokyo, Osaka, Kyoto, and others. Unlimited data (subject to fair usage policies) makes it ideal for navigation, messaging, streaming, and remote work during short getaways.
One of ByteSim’s best perks is its unrestricted hotspot usage, so you can share your data with laptops or travel companions as much as you want.
Following the purchase, you get a QR code by email, and setup takes only a few minutes. Then, you can monitor usage or recharge your data through the ByteSim app.
Regardless of ‘unlimited’ plans pertaining to fair usage policies, ByteSim transparently displays data caps before you buy, so your trip won’t be ruined by any bad surprises. Combined with Japan’s superb mobile infrastructure and KDDI’s network reliability, ByteSim delivers speedy and stable connectivity for your trip.
Are you a pro? Subscribe to our newsletterContact me with news and offers from other Future brandsReceive email from us on behalf of our trusted partners or sponsorsBy submitting your information you agree to the Terms & Conditions and Privacy Policy and are aged 16 or over. Sead FadilpašićSocial Links NavigationSead is a seasoned freelance journalist based in Sarajevo, Bosnia and Herzegovina. He writes about IT (cloud, IoT, 5G, VPN) and cybersecurity (ransomware, data breaches, laws and regulations). In his career, spanning more than a decade, he’s written for numerous media outlets, including Al Jazeera Balkans. He’s also held several modules on content writing for Represent Communications.
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