If your data capacity is running low and you want to increase it, but you're unsure how to go about buying more, you can refer to the following article by Hallo for an overview and detailed information on the methods and procedures for purchasing additional Softbank data capacity.
Softbank Packages
Using a data SIM in Japan is one of the most convenient ways to stay connected while on the go without WiFi. Softbank data SIM is one of the three carriers with fast access speeds and multiple package options for users to choose from. There are two types: prepaid SIM and monthly subscription SIM with packages ranging from 1-100GB.

Softbank data SIM
Prepaid SIM: Available in capacities of 1G, 3G, 5G.
Cost: ¥8000 - ¥9000.
Advantages:
Able to receive text messages.
Each month has 1G, 3G, 5G/day depending on the package you subscribe to.
Fast 4G access speed.
Can call to 050 numbers.
Quick registration process.
Disadvantages:
Limited data, once high-speed data is used up, the speed becomes very slow.
Affordable price.
High risk of network disconnection.
User Profile:
Suitable for travelers or short-term business visitors to Japan.
Suitable for users with low data usage: browsing the web, reading news, etc.
Monthly Subscription SIM: Available in capacities of 30, 50, 100, 200GB for use within one month, with options to purchase packages for 2 or 6 months.
Advantages:
Can call to 050 numbers.
Able to receive text messages.
Simple registration process.
Can register for apps requiring OTP confirmation: Amazon, Line, etc.
Fast access speed.
Large data capacity.
Disadvantages:
Only compatible with international phones.
High price, so often used for fewer months.
Cannot share the network with multiple devices.
User Profile:
Suitable for international students, expatriate workers in Japan.
People with high data usage needs.
Note: You can choose between prepaid SIM and monthly subscription SIM depending on your usage needs to avoid having to purchase additional data. If you're still looking for a place to buy data SIM, you can visit the Hallo.co website.
Checking Softbank Data Capacity
Method 1: Checking on your phone
Step 1: Go to settings, open the mobile section, scroll to mobile data.
Step 2: Look at the current time to see how many GB you are using in each specific app.
Note: For phones that don't count MB per month, you can scroll down to the bottom and select "Reset statistics," it will show you detailed information about how many GB you used in a day.
Illustration image of resetting statistics
Method 2: Checking on the web
Step 1: Access the website here.
Web interface image
Step 2: Enter your phone number and the date you want to check, the website will show you how many GB you have used each day. You can also check 1-2 months ago.

Purchasing Additional Softbank Data Capacity
Purchasing Additional Softbank Data Capacity
If you're using data and run out of capacity, you can try purchasing more using the following methods:
For prepaid SIMs for 3 months, 6 months, or 1 year, once the time is up, discard the SIM.
For monthly subscription SIMs, there's no way to purchase additional capacity yourself; you'll need to buy a new SIM with a higher capacity.
For example: If you're using a 50GB SIM, you can purchase a 100GB unlimited capacity SIM.
Note:
Do not use cheap online services to increase capacity to 200GB, 300GB because if the carrier detects tampering with data, they will cut off and cancel the SIM, and you won't be able to use it.
Not all Softbank data SIMs appear on the website. If you enter your phone number and it doesn't display results, you can use the phone checking method.
Illustration image of a 100GB SIM fully loaded at ¥3500
These are the details on how to purchase additional Softbank data capacity in Japan. You can message via Messenger or fill out the 24/7 form on the Hallo.co website for assistance!
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