Data Increase Option

Starting January 1, 2025, the data capacity of the "Data Increase Option" for "Simple 2 M/L" will be revised from 10GB to 5GB.

Learn more

Prices shown include tax unless otherwise stated.
The amount may differ from the invoice amount due to the calculation of consumption tax.
The 6-month free trial does not apply to corporate contracts.

Eligible rate plans

Simple 2 S/M/L, Simple S/M/L, Smartphone Plan, Smartphone Basic Plan

application	need
Monthly fee	550円First month free★

★Limited to those who apply for and sign up for the data increase option for the first time
●Even if you sign up or cancel in the middle of the month, the monthly fee will not be calculated on a pro rata basis.
●If you apply for a new contract at the same time, the discount will be applied from the month of application. For other applications, the discount will be applied from the following month.

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The procedure is
This is also possible with Y!mobile compatible app!

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Please make a reservation in advance before visiting.

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Increased high-speed data traffic!

Adding this option will increase your high-speed data traffic.

Simple 2 S/M/L

	Simple 2 S	Simple 2M	Simple 2 L
Normal data traffic (Regular capacity)	4GB	30GB ^※1	35GB ^※1
Data increase option increase	+2GB	+5GB ^※2	+5GB ^※2
total	6 GB	35 GB	40 GB

Simple S/M/L

	Simple S	Simple M	Simple L
Normal data traffic (Regular capacity)	3GB	15GB	25GB
Data increase option increase	+2GB	+5GB	+5GB
total	5 GB	20 GB	30 GB

For Smartphone Plan and Smartphone Basic

The data capacity added with this option can be used to return to normal speeds when you have used up the data capacity specified in your rate plan and your communication speed has slowed down.
Depending on your rate plan, the additional charge for restoring normal speeds (hereinafter referred to as the "additional charge") will be discounted as follows:

Eligible plans	Data increase option increase	Additional free charges
Smartphone Plan S	+1GB	0.5GB x 2 times
Smartphone Plan M/R	+3GB	0.5GB x 6 times
Smartphone Plan L	+7GB	0.5GB x 14 times
Smartphone Basics	+7GB	0.5GB x 14 times

*1 From January 1, 2025, Simple 2 M will increase by 10 GB, and Simple 2 L will increase by 5 GB. If you use the 10 GB or 5 GB increase due to the advance campaign, the fee for returning to the normal speed for that month (500 MB/550 yen) will be discounted up to 20 or 10 times (not eligible for carryover).
*2 An additional 5GB will be added until the planned revision of Simple 2 M/L, bringing the total to 10GB.
*Customers must apply to restore normal speeds via My Y!mobile etc.
* Discounts on additional charges will be applied at the time of invoice.
*If you change your rate plan, the number of free additional charges and discount amount according to the new rate plan will be applied.

Carry-over when subscribing to the data increase option

Simple 2 M: From January 1, 2025

The standard capacity of Simple 2M is 30GB, but the 10GB increase from the advance campaign cannot be carried over.

* The maximum amount of data that can be carried over to the next month is the data capacity of the plan subscribed to the following month (including the increase in data capacity due to data increase options).
* Data volume will be consumed in the following order: carried-over data > default data volume (including data increase through data increase options) > additional purchased data volume.
* Carried-over data volume can be used until the end of the following month. The standard volume for Simple 2M is 30GB, but the 10GB increase from the advance campaign is not eligible for carryover, so only the 20GB excluding the advance campaign volume and the data volume increased by the data increase option can be carried over. The additional data volume purchased when applying to return to the normal speed cannot be carried over. Any amount less than 100MB of data to be carried over will be rounded down.
* For shared plans, data can be carried over during the period when data capacity is shared with the parent line (while sharing is in effect). However, unused data capacity from the month before sharing with the parent line begins and the final month when sharing is terminated will not be carried over to the next month.

Important Notice for Customers Setting Up Auto Charge

From September 1, 2021, Simple S/M/L customers who have set Auto Charge to 1-14 times will be asked to turn it off, since data volume added by subscribing to the Data Increase Option will no longer require additional data volume purchase procedures. To change the setting, please apply here. *You will need to log in to My Y!mobile.
You will be charged (0.5GB/550 yen) for any data volume purchased through auto-charge before the settings are changed.

* Customers who have subscribed to the Smartphone Basic Plan/Smartphone Plan/Keitai Basic Plan SS/Keitai Plan SS data increase option and have auto-charge set up will also fall under the above when changing their plan to Simple S/M/L.
*Changes to auto-charge settings will be reflected immediately.

Notes:

●For customers who are currently taking advantage of a campaign that offers increased data volume, the campaign will be applied first, so your data volume will remain the same. However, no monthly fees will be charged if you apply for a data increase option while the campaign is in effect.
●Even if you sign up or cancel in the middle of the month, the monthly fee will not be calculated on a pro rata basis.
●If you apply for a new contract at the same time, the discount will be applied from the month of application. For other applications, the discount will be applied from the month following application.
●For customers who have subscribed to the data increase option with Simple S/M/L before August 17, 2021, the change in the option content and the carryover of increased data from the data increase option will be applied from September 1, 2021. Until the change, the previous content of the data increase option (discount on the additional charge for applying to return slower communication speeds to normal speeds) will apply.
●If you exceed the 5GB carryover limit, your communication speed will slow down.
●This option cannot be used in conjunction with previous promotions that increased data capacity (such as double data capacity promotions).