Exploring Japan's Mobile Carriers: SoftBank, IIJmio, NTT Docomo, and au

Exploring Japan's Mobile Carriers: SoftBank, IIJmio, NTT Docomo, and au

Japan's Top Mobile Carriers: SoftBank, IIJmio, NTT Docomo, and au by KDDI

Japan's mobile network landscape is highly advanced, offering a range of carriers that cater to various needs, from extensive coverage to budget-friendly plans. Whether you're a resident or a traveler, choosing the right carrier is essential. In this article, we introduce four of Japan's leading mobile carriers: SoftBank, IIJmio, NTT Docomo, and au by KDDI.

1. SoftBank: Comprehensive Coverage with Global Reach

SoftBank is one of Japan's telecommunications giants, known for its extensive network coverage and diverse service offerings. Whether in a major city or a rural area, SoftBank ensures reliable connectivity.

  • Network Coverage: SoftBank offers strong 4G and 5G coverage across Japan.
  • Global Roaming: Ideal for international travelers with partnerships in over 200 countries.
  • Plans: Various plans, including unlimited data and family options, are available.
  • Best For: Those who value strong network coverage, frequent travelers, and families looking for bundled plans.

2. IIJmio: The Smart Choice for Flexibility, Affordability, and Quality

IIJmio stands out as a highly reliable MVNO (Mobile Virtual Network Operator) that offers exceptional value without sacrificing quality. Utilizing both NTT Docomo's and au's networks, IIJmio provides dependable coverage and a customer-focused approach that ensures satisfaction.

  • Exceptional Value: IIJmio offers highly competitive pricing with flexible data plans, making it perfect for those who want to control their mobile expenses without compromising on service quality.
  • Network Reliability: By leveraging the robust networks of NTT Docomo and au, IIJmio ensures widespread coverage and stable connections, rivaling even the major carriers.
  • Customization: IIJmio allows users to tailor their mobile experience with data-only SIMs, voice SIMs, or combinations of both. This flexibility is particularly beneficial for those with specific needs, such as data-heavy users or those who primarily use their phones for calls.
  • eSIM Support: IIJmio’s support for eSIM technology offers added convenience, especially for tech-savvy users and travelers who want a quick, hassle-free setup.
  • Best For: Budget-conscious users, those seeking flexible and reliable mobile plans, and tech enthusiasts who appreciate cutting-edge solutions like eSIM. Whether you're a heavy data user, a frequent traveler, or someone who simply values flexibility, IIJmio provides a robust and dependable mobile experience.

Japan eSIM plan

Get More for Less—Try IIJmio and Enjoy Flexible Plans!

japan esim plan

3. NTT Docomo: Japan’s Largest and Most Reliable Network

NTT Docomo is Japan’s largest mobile carrier, known for its extensive network coverage and premium services. With over 80 million subscribers, it is a trusted name in Japan's telecommunications landscape.

  • Nationwide Coverage: NTT Docomo offers the most extensive network coverage in Japan, including strong 5G availability in urban areas.
  • Premium Services: The carrier offers a variety of high-quality services, including streaming, cloud storage, and exclusive content for subscribers.
  • Plan Variety: NTT Docomo provides a range of plans, including family sharing options, unlimited data, and tailored solutions for various user needs.
  • Best For: Users who prioritize network reliability, families needing shared plans, and those who want access to the latest mobile technology.

4. au by KDDI: High-Speed Network with a Focus on Entertainment

au, operated by KDDI, is another leading mobile carrier in Japan, known for its high-speed network and strong focus on entertainment services. It’s a great choice for users who want fast, reliable connections and access to exclusive content.

  • High-Speed Connectivity: au offers extensive 4G and 5G coverage, with a focus on providing high-speed data for streaming and gaming.
  • Entertainment Services: au subscribers can enjoy a wide array of entertainment options, including music, video streaming, and gaming platforms.
  • Plan Flexibility: au offers a variety of plans, including those tailored for heavy data users, families, and individuals looking for a mix of services.
  • Bundling Options: au also provides bundling with other KDDI services, such as home internet and TV, for added convenience and savings.
  • Best For: Entertainment enthusiasts, heavy data users, and those looking for bundled services.

 

Conclusion

Selecting the right carrier in Japan depends on your individual needs. If you require widespread coverage and premium services, NTT Docomo is a solid choice. For those who prioritize affordability, flexibility, and reliable service, IIJmio is an outstanding option that competes head-to-head with the larger carriers. SoftBank is ideal for frequent travelers and families, while au is perfect for entertainment lovers and heavy data users.
No matter which carrier you choose, Japan's advanced mobile networks ensure you’ll stay connected wherever you go.

Back to blog
【Iceland Spots】Explore Iceland: Top Tourist Spots and Travel Tips

【Iceland Spots】Explore Iceland: Top Tourist Spots and Travel Tips

Explore Iceland's must-see spots—from Reykjavik's Hallgrimskirkja to the glaciers and stunning South Coast waterfalls.

【Savor Germany】5 Must-Try Foods in Germany

【Savor Germany】5 Must-Try Foods in Germany

Explore the top 5 must-try German dishes, including the crispy Schweinshaxe, black forest cake, the iconic pretzel, etc.

【Savor Malaysia】5 Must-Try Foods in Malaysia

【Savor Malaysia】5 Must-Try Foods in Malaysia

Discover must-eat Malaysian dishes like Nanyang food, nasi lemak, durian, and seafood noodles. Explore the rich flavors of this vibrant cuisine!

【Savor Spain】6 Must-Try Dishes in Barcelona

【Savor Spain】6 Must-Try Dishes in Barcelona

Discover the best must-eat dishes in Barcelona, from paella and sangria to Spanish omelette and creamy Basque cheesecake. Explore the rich flavors of Spain's culinary scene.

【Savor Norway】4 Must-Eat Foods in Norway

【Savor Norway】4 Must-Eat Foods in Norway

Discover Norway's must-eat dishes in Oslo and Bergen, from the unique flavors of brown cheese products and traditional bread to creamy fish soup and Norwegian hot dogs.

【Savor Japan】Must-Try Foods in Sendai

【Savor Japan】Must-Try Foods in Sendai

Explore the rich flavors of Sendai, Japan with our guide to must-try foods, including gyutan (beef tongue), zunda sweets, yakiniku, pastries, and cakes.

【Savor Japan】Indulge in Sukiyaki at Moritaya and Imahan

【Savor Japan】Indulge in Sukiyaki at Moritaya and Imahan

Explore the culinary differences between Kansai and Kanto sukiyaki at iconic restaurants. Discover their unique flavors and menu offerings.

【Savor Japan】Top Pancakes: Where to Enjoy Fluffy Pancakes

【Savor Japan】Top Pancakes: Where to Enjoy Fluffy Pancakes

Discover Japan's top pancake spots, from Hokkaido to Fukuoka.  

【Australia Spots】Explore Melbourne: Top Tourist Spots and Travel Tips

【Australia Spots】Explore Melbourne: Top Tourist Spots and Travel Tips

Uncover the best of Melbourne with our guide to top attractions, scenic drives, and day trips. From the iconic Twelve Apostles to the vibrant city center.

【Japan Spots】Ultimate Guide to Skiing in Niseko, Japan

【Japan Spots】Ultimate Guide to Skiing in Niseko, Japan

Get comprehensive tips on skiing in Niseko, Japan, including dining, accommodation, gear, rentals, and more.

【Savor Japan】Top Ramen Restaurants: Must-Try Spots

【Savor Japan】Top Ramen Restaurants: Must-Try Spots

Discover Japan’s top ramen spots, from chicken ramen rich tonkotsu. Find the best bowls across Japan.

【Savor Japan】Hidden Snack Gems – Lesser-Known Yet Delicious Treats

【Savor Japan】Hidden Snack Gems – Lesser-Known Yet Delicious Treats

Looking for snacks beyond the usual favorites? Explore more delicious treats beyond the classics.

【Savor Sweden】5 Must-Try Foods in Stockholm

【Savor Sweden】5 Must-Try Foods in Stockholm

Explore Stockholm's top Swedish dishes, pastries, and seafood at must-visit spots.

【Savor Sweden】Authentic Swedish Cuisine in Stockholm

【Savor Sweden】Authentic Swedish Cuisine in Stockholm

Explore Swedish culinary heritage at Restaurant Tradition. From meatballs to Arctic char, this cozy spot offers a true taste of Sweden.

Travel Checklist & Tips: Pack Smart

Travel Checklist & Tips: Pack Smart

Get ready for your next adventure with our essential travel checklist and insider tips.

【Savor Japan】Yotsuba White Cozy: The Café You Can't Miss

【Savor Japan】Yotsuba White Cozy: The Café You Can't Miss

Experience exceptional dairy delights and a charming atmosphere that makes this cafe stand out. Perfect for travelers and food lovers alike.

【France Spots】Capture the Beauty of the Eiffel Tower

【France Spots】Capture the Beauty of the Eiffel Tower

From iconic viewpoints to hidden gems, discover the best spots to capture the Eiffel Tower's beauty.

【Japan Spots】Must-Visit Destinations for Autumn Leaves

【Japan Spots】Must-Visit Destinations for Autumn Leaves

Discover Japan’s most picturesque autumn leaf spots, from Tokyo’s Meiji Jingu to Hokkaido University. This guide provides tips, best viewing times, and insider advice for experiencing the vibrant colors of Japan’s autumn season.

【Savor Austria】Ribs of Vienna: The Restaurant You Can't Miss

【Savor Austria】Ribs of Vienna: The Restaurant You Can't Miss

Discover Ribs of Vienna, a popular restaurant in the heart of Vienna, known for its succulent pork spareribs, beef steaks, and memorable dining experience.

A Guide to Choosing the Right Travel Roaming Plan

A Guide to Choosing the Right Travel Roaming Plan

Explore the three main types of travel data plans—Unlimited, Daily, and Fixed Data Plans—and learn how to choose the best option for your travel needs.

Where to Travel in 2025: Top Holiday Destination Ideas

Where to Travel in 2025: Top Holiday Destination Ideas

Wondering Where to Travel in 2025? The 2025 Holiday Travel Guide offers top destinations and tips for each holiday, from romantic getaways to family adventures, helping you plan unforgettable trips throughout the year.

Getting around Hong Kong: A Guide to Public Transport

Getting around Hong Kong: A Guide to Public Transport

Discover how to navigate Hong Kong with ease using our comprehensive guide to buses, trains, and taxis. Learn about routes, payment methods, and tips for smooth travel in HK.

Es Con Field Hokkaido Travelogue

Es Con Field Hokkaido Travelogue

Es Con Field Hokkaido - A Revolutionary Ballpark in Japan The stadium features a retractable roof, diverse dining options, onsen and sauna facilities, a hotel, and extensive shopping opportunities.