Climbing Mount Fuji is a dream for many international travelers visiting Japan—but as the altitude rises, so do the challenges, especially when it comes to communication and safety. Fortunately, with au’s 5G and 4G LTE network, even the summit is within reach for those using eSIMs with unlimited data.
In KDDI-au’s article “標高3,776mでau 5Gがつながる！安心・安全な富士登山のためのKDDIの取り組み”,
the company details how its au network brings 5G and 4G LTE coverage all the way to the summit of Mt. Fuji (3,776 meters / 12,388 feet), making it possible for eSIM users with unlimited data to stay online, informed, and safe throughout their climb.
The Challenge: Building a Network at 3,776 Meters (12,388 Feet)
Since 2009, KDDI-au has provided mobile service during Mt. Fuji’s official climbing season (early July to early September). In 2021, they launched 5G coverage at the summit, making it Japan’s highest mobile service point.
To ensure performance, KDDI-au engineers carried out an on-foot inspection from the fifth station (approximately 2,300 meters / 7,546 feet) to the top, equipped with:
- 📱 Multiple smartphones
- 🔋 Backup batteries
- 📡 Signal measurement tools
The result:
- ✅ Stable 4G LTE throughout the trail (from ~2,300m / 7,546ft to 3,776m / 12,388ft)
- ✅ 5G access at the summit, even under harsh conditions
Thanks to this, travelers using eSIMs can now rely on mobile data for:
- Navigation apps
- Weather updates
- Emergency contact
- Real-time sharing of their Mt. Fuji adventure
Safety Meets Technology: Why It Matters for eSIM Travelers
Climbing Mt. Fuji isn’t just beautiful—it’s also demanding. That’s why connectivity is critical for both enjoyment and emergency preparedness.
With KDDI’s mobile coverage, eSIM users benefit from:
✅ Safer climbs through access to emergency services and updates
✅ Easier route tracking and real-time GPS navigation
✅ Seamless uploading of summit selfies and videos
✅ Peace of mind for friends and family back home
Virtual Mt. Fuji: Experiences for Non-Climbers
Even if you’re not climbing, KDDI brings the beauty of Mt. Fuji to your fingertips with digital content, including:
- 🎥 Katsumata Kunikazu’s Virtual Guide Tour – Learn Mt. Fuji’s history and geography through video and AR
- 📸 Machikame – A remote DSLR service that lets you take a professional-quality photo of Mt. Fuji, from anywhere
These services combine the power of 5G and cloud technology to make Japan’s natural wonders more accessible to everyone.
What It Means for eSIM Users in Japan
Whether you’re trekking to Japan’s tallest peak or just exploring nearby towns, using an eSIM with 5G and unlimited data gives you:
✅ Reliable coverage in rural and high-altitude areas
✅ Access to real-time data and apps that enhance your travel
✅ A safe and modern climbing experience, powered by Japan’s top-tier network
✅ Seamless connectivity across your entire Japan journey
Conclusion
Thanks to KDDI’s investment in advanced mobile infrastructure, Mount Fuji is now more than just iconic—it’s digitally connected. Travelers with eSIMs can now climb with confidence, knowing they’ll stay online from 2,300 meters (7,546 feet) to 3,776 meters (12,388 feet).
👉 Buy your Japan eSIM now and enjoy high-speed, unlimited data—even at the top of Japan.
