Applies to contracts for users aged 5 to 18! Limited time offer! 0 yen administrative fee *Conditions applyApplies to contracts for users aged 5 to 18! Limited time offer! 0 yen administrative fee *Conditions apply
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Family discount

With the launch of Simple3 on September 25, 2025, we will be expanding the eligible Price Plan from September 25, 2025.

Y!mobile launches new Price Plan" Simple3"

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

Overview

If you sign up for multiple lines used by family members or others under a designated Price Plan, the monthly basic charges for each line from the second line onwards will be550円or1,100円、1,188円(Discount applies to up to 9 lines)
This also applies if one person subscribes to multiple lines.

  • ※These are eligible Price Plan that are currently available for application. (Mobile Basic Plan SS and Data Basic Plan S are not eligible.)
    For details, such as applicable Price Plan that are no longer accepting applications, please refer to the terms and conditions of offer.

What does "family" mean in Family Discount service?

It can be confirmed that you are family (blood or marriage) or live at the same address.
Family verification documents are required for the procedure.

  • Blood and marriage
    • Family members living together
    • Families living apart
      There are no requirements regarding the degree of kinship.
  • Same address
    • Contract holders who can be confirmed as having the same address (different surnames are acceptable)

Items needed when applying

  • 1. Family identification documents

Family verification documents are documents that prove your relationship with the contract holder.
This includes documents that can verify the same surname or address, or a single document that can prove your relationship with the contract holder.

Please bring one of the following:

  • ●Identity verification documents for each person that can verify the same surname or address
  • ●Evidence of your relationship with the contract holder
    (Documents such as a Certificate of Resident Registration Details, Certificate of Eligibility, Resident Card, or Certified (Extract) Family Register, which list the names of both the contract holder and the agent. However, a Certificate of Resident Registration Details, Resident Card, or Certified (Extract) Family Register must be issued within the last three months.)
  • ●Documents proving same-sex partnership
  • 2. Consent from Family Discount main line subscriber (consenter)
    Please complete the procedure in advance through the online consent site, Family Discount Service Agreement Please prepare the following.
    For details on obtaining consent through the online consent site, Here

Click here for details on family identification documents

ご来店に必要な持ちもの

ご用意いただく書類は、「どなたが来店されるか」によって異なります。

1回線目（主回線）、2回線目以降（副回線）とします。

以下の3つのパターンのうち、あてはまる「持ちものリスト」をご確認ください。

First line(主回線)・2回線目(副回線)の方がご来店の場合

ご家族揃ってのご来店が、最もお手続きがスムーズです。

  • □ 主回線・副回線の方それぞれの「本人確認書類」
    運転免許証、マイナンバーカードなど (詳しくはこちら)
    ※「本人確認書類」のみで同姓または同住所であることが確認できない場合は、あわせて「2. 家族確認書類」をご用意ください。
  • □ 家族確認書類
    ご家族（血縁・婚姻）、もしくは同住所でであることが確認できる書類が必要です。
    ・戸籍謄本や住民票などの「家族確認書類（発行から3ヵ月以内のもの）」など その他 (詳しくはこちら)

First line(主回線)の方がご来店の場合

副回線の方の手続きを代行することになるため、「委任状」が必要です。

  • □ ご来店者（主回線）の「本人確認書類」
    運転免許証、マイナンバーカードなど （詳しくはこちら）
  • □ 家族確認書類
    副回線となるご契約者様とご家族（血縁・婚姻）、もしくは同住所であることが確認できる書類
    ・戸籍謄本や住民票などの「家族確認書類（発行から3ヵ月以内のもの）」など その他 (詳しくはこちら)
  • □ 家族割引サービス同意書
  • □ 委任状
  • 事前に印刷のうえ、副回線となるご契約者さまの情報をご記入いただき、ご来店ください。

同意書ダウンロード

Download the power of attorney form

Second and subsequent lines(副回線)の方がご来店の場合

主回線の方の「同意」を証明する書類が必ず必要になります。

  • □ ご来店者（副回線）の「本人確認書類」
  • □ 家族確認書類
    主回線となるご契約者さまとご家族（血縁・婚姻）、もしくは同住所であることが確認できる書類
    ・戸籍謄本や住民票などの「家族確認書類（発行から3ヵ月以内のもの）」など その他 (詳しくはこちら)
  • □ 家族割引サービス同意書
  • 事前に印刷のうえ、主回線となるご契約者さまの情報をご記入いただき、ご来店ください。

About application

Please apply through My Y!mobile *1, Y!mobile shops and dealers nationwide, or the online store *2.

Apply through My Y!mobile Online Store
Product List

Shops and Dealers

  • *1 If you apply through My Y!mobile, you cannot apply with devices that cannot receive SMS (Pocket WiFi®, tablets).
  • *2 Applications can only be made via the online store if the new line is to be used as a secondary line.
  • *You cannot apply for the service at the same time as signing the contract via the PayPay mini app, so please apply via My Y!mobile after signing the contract.

Notes

  • ●The first line (main line) and the second and subsequent lines (secondary lines) will be specified by the customer when applying for the contract. Up to nine secondary lines, excluding the main line, can be specified.
  • ●This offer does not apply to corporate customers.
  • ●以下の場合、当社指定プランによる提供は終了となり、翌料金月より2回線目以降（副回線）の料金プラン月額基本使用料・電話ユニバーサルサービス料、電話リレーサービス料が発生いたします。
    （副回線を料金プラン変更した場合の月額基本使用料は変更日以降、発生いたします。）
    • 【1】If the Y!mobile communication service contract for the first line (main line) is canceled.
    • 【2】If the first line (main line) or the second or subsequent lines (sub-lines) is changed to Price Plan other than the plan specified by our company.
  • ●There are some services for which discounts cannot be applied in conjunction with other services, such as Home Bundle Discount Hikari Set (A) and Home Bundle Discount Hikari Set (A) application benefits.

Please refer to the terms and conditions for details.

Family Discount Service Terms and Conditions

FAQs

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