
SoftBank’s Strong Network on Tokyo’s Yamanote Line | Smiles Connect
Data tips
Tokyo’s JR (Japan Railway) Yamanote Line is one of the busiest train lines in the world, carrying millions of passengers every day. Reliable mobile connectivity is important for commuters who depend on stable internet access for work, entertainment and staying connected with loved ones. Smiles Connect offers data SIM cards that connect to SoftBank, which has made investments in its network infrastructure, ensuring strong and high-quality mobile coverage throughout the Yamanote Line.
Let’s take a look at how SoftBank SIM cards provide fast internet speed on the Yamanote Line in Japan.
SoftBank’s high internet speed and strong network performance on Yamanote Line
SoftBank has continuously expanded and focused on improving its mobile network in high-traffic areas, including all major stations and tunnels along the Yamanote Line. Here are the key highlights of SoftBank’s network performance and the reasons it’s so great:
- Strong 4G and 5G range: SoftBank provides extensive coverage across the whole Yamanote Line, ensuring its SIM cards have uninterrupted connectivity even in underground and crowded areas.
- Wide and direct data coverage: Over the course of one year, SoftBank installed around 200 base stations. Signals point directly to the trains and platforms for better internet speed.
- High-speed data performance: SoftBank data plans’ advanced infrastructure minimizes internet speeds slowing down during peak hours, delivering fast and reliable connection.
- Constant analysis and enhancements: SoftBank identifies poor quality areas by analyzing communication data quality from base stations and models. They also use customer feedback and AI for further analysis.
- Regular check-ups and inspections: Because data usage on the Yamanote Line fluctuates, in addition to analyzing the big data, SoftBank regularly visits the site to measure communication quality and investigate user experience.

Why Smiles Connect SoftBank SIM cards are the best option
Smiles Connect offers affordable SIM card data plans that run on SoftBank’s powerful network. This means that customers can enjoy the same high-quality connectivity and reliability while benefiting from flexible and affordable plans. Here’s what makes Smiles Connect the ideal choice for foreign residents in Japan:
- Affordable SIM data plans: Get 50GB for just 2,680 yen per month or 100GB for 3,680 yen per month, perfect for those long calls with your family, playing games with your friends or keeping up to date on your loved ones on social media.
- No credit card needed: Smiles Connect makes it easy for foreign residents by allowing payments via the Smiles Wallet. You can also save time and energy compared to making a monthly convenience store run.
- Data rollover available: Whatever you don’t use this month will be rolled over to the following month. Up to 50GB can be carried over so you can get the best value for your money.
Check out Smiles Connect SIM plans in Japan
If you’re looking for SIM plans for foreigners in Japan, Smiles Connect can provide you with your phone’s internet or home Wi-Fi. Experience fast internet speeds, friendly multilingual customer service, pay without a credit card and get great deals on SIM plans to connect and “Share Smiles” with your loved ones abroad.
To see all Smiles Connect voice and data SIM plans and benefits, click here.
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