As of August 17, 2021, we have stopped accepting new applications for data SIM plans.
Existing customers can continue to use the service even after the end of new applications.

Prices shown include tax unless otherwise stated.
The amount may differ from the invoice amount due to the calculation of consumption tax.

Data SIM Plan

The "Data SIM Plan" is a data-only plan for those who purchase a SIM starter kit.
You can enjoy high-speed 4G data up to 1GB/month at an affordable rate.

  • If you would like to use voice calls with the SIM starter kit, please use the Smartphone Plan S/M/L.
  • Discounts and benefits may vary by store. Please check with your store for details.

High-speed data communication at a reasonable price

  • If the amount of data communication used in a given month exceeds the amount stated above (1GB), the data communication speed will be slowed down (maximum 128kbps for sending and receiving) until the end of that month.
  • If you want to return to normal speeds, an additional fee of 550 yen will be charged for every 0.5 GB.
    (You can apply to return to the normal speed via My Y!mobile. Each application will only apply for the current month.)

Monthly payments

Contract TypeBasic fee
Data SIM Plan1,078円
  • There is no set contract period for the "Data SIM Plan."
  • If you sign up in the middle of the month, the monthly fee will be calculated on a pro rata basis. However, if you cancel in the middle of the month, the fee will not be calculated on a pro rata basis.
  • A universal service fee will be charged separately.
  • There is no set contract period for the "Data SIM Plan."
  • Even if you sign up or cancel in the middle of a month, the basic fee will not be calculated on a pro rata basis.
  • A universal service fee will be charged separately.

Available optional services

Notes

  • You cannot change to another plan.
  • Products that have not been unlocked cannot be used.
  • We may restrict the use of communication services for smartphones that have been fraudulently contracted or obtained illegally.
    Learn more Please check.
  • Charges will still be incurred even if you are unable to use services purchased for a fee through applications downloaded from Google Play™ or other services.
  • Depending on the model you use, communication charges may be incurred as the device automatically communicates, etc. For details on product specifications, please check with the carrier that sold you your mobile phone.
  • We cannot provide after-sales services such as accepting repairs or handling of mobile phones sold by other companies, or answering questions about combining with Y!mobile Mobile USIM cards. For matters regarding mobile phones sold by other companies, please contact the company that sold you the mobile phone.
  • We are not responsible for any issues that arise from using a Y!mobile phone sold by another company.
  • The terms and conditions for the discounted data SIM plan offered by SoftBank Corp. are as follows: Here

Content and services that may be restricted when used

In order to provide customers with better network quality, we collect, analyze, and store traffic information for each communication. In addition, we may restrict communication speeds when using the following content and services.

subject Contents
Communications using VoIP (Voice over Internet Protocol) A service that converts voice calls, video calls, etc. into packet signals and realizes them as data communications.
Part of a video, image, etc. Video files in MPEG, AVI, MOV format, etc.
Image files in BMP, JPEG, GIF format, etc.
Packet communication involving large amounts of data or long-term connections Sites and apps that require long-term connection, such as video viewing, high-resolution image viewing, etc.
  • The communication will not be disconnected.
  • The standards may be revised depending on future communication quality conditions.
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