mamorino Watch Plan

This is a mamorino Watch rate plan for kids in elementary school and younger. The Upgrade Program (Junior) is also included for free, allowing you to affordably switch models to match your child's growth.




Monthly basic charge

When 2-year contract [1] is applied


Before application for various discount services


Domestic calling charge

To au mobile phones

Free between 1:00 and 21:00
¥20/30 sec between 21:00 and 1:00

Calls made between family members are free [2]

To other carriers' mobile phones or landline

¥20/30 sec all day

Data communications charge


Domestic SMS (C-mail)

To au mobile phones


To other carriers' mobile phones and PHS

Sending: ¥3/time
Receiving: Free

  1. 2-year contract is automatically renewed in two-year units. In the case of contract termination, a contract cancellation fee of ¥9,500 is incurred (excluding the renewal period). Smile-heart Discount also apply.
  1. When 2-year contract (Smile-heart Discount or 2-year contract(No automatic renewal)) + Family Discount are applied, calls made to family members who are subscribed to the same Family Discount are free.

Eligible models and subscription conditions

Subscription is available only to users who are in elementary school or younger at the time they subscribe to the plan and purchase the mamorino Watch.

Free benefit: Upgrade Program (Junior)

If you purchase the mamorino Watch with an installment contract (36 months), when you switch to the next model, the remaining amount for installment payments of the mamorino Watch is essentially zero.


<Applicable conditions>

If conditions (1) and (2) which follow are satisfied, the benefit is applied.

(1) mamorio Watch is used for 18 months before switching models (to a model eligible for the Upgrade Program)
(2) When you switch models, you relinquish the previous model.


Universal service system

In accordance with the launch of the "Universal Service System", KDDI has begun imposing a "Universal Service Fee" on customers who signed contracts with us for their portion of usage since January, 2007.
See below for the details.


[About the mamorino Watch Plan]

  • This plan cannot be used with models other than eligible models. Also, this plan is not eligible for the Student Discount or the Extra Option.
  • When applying at the time of making a new subscription or switching models, this plan becomes applicable from the date of subscription or the date of switching models. Charges are prorated in cases where you cancel a contract before the end of a month.If you are subscribed to 2-year contract and cancel Junior Smartphone Plan, calculation on a prorated basis is not applied and the flat rate is incurred.
  • For calls that straddle the 9:00 pm or 1:00 am time designations, charges are waived for the time segment straddling the time designation (30 seconds). Calls to special numbers including the Answering Service (Voice Mail) (1417) do not count as free calls. If KDDI determines that your call is continually long or it is affecting other calls, we may disconnect that call.
  • Free call allowance in this plan is not eligible for sharing.
  • LTE NET usage fees (¥300/month) are not incurred.
  • The maximum communication speed for sending and receiving is 128kbps. (Note that the maximum communication speed is not the actual communication speed, but the maximum value based on the technical standards (This is a best-effort service.).
  • If you have changed the SIM, this plan is not applied.

[About the About the Upgrade Program(Junior)]

  • If you purchase the device with a single lump payment or from the au Online Shop; change rate plans, collectively pay the installment amounts; transfer, suspend, or cancel your line; or change your model before the 17th installment payment, this program's benefit does not apply.
  • This program's benefit is available for the amount remaining after the 18th payment.
  • After changing models, the remaining installment payments are continued to be billed. However, the remaining installment payments through this program are discounted monthly from the month you change models making the amount you pay essentially zero.
  • The following types of models are not eligible for return and are not subject to use of the benefit.

    (1) The power does not turn on

    (2) The charging lamp does not turn on when charging

    (3) The body or screen of the phone is damaged or cracked

    (4) The passcode lock is not cancelled and the phone has not been completely reset

    (5) There is a response to water leakage stickers placed in manufacturer-designated locations

    (6) The serial number cannot be confirmed, the device has been modified, or other circumstances that void the manufacturer warranty

  • Backup of data and initialization of the device being returned is the responsibility of the customer.

    After the device is returned, all data is deleted and cannot be recovered. 

  • When returning, remove all memory cards, straps, and other accessories. After returning, all accessories will be disposed of.
  • By phoneOpen 9:00 – 20:00

    • English

      0120-959-472(Toll Free)

    • Portuguese

      0120-959-473(Toll Free)

    • Chinese

      0120-959-476(Toll Free)

    • Korean

      0120-959-478(Toll Free)

    • Tagalog

      0120-933-952(Toll Free)

    • Vietnamese

      0120-933-961(Toll Free)

    • Japanese
      about au mobile services

      157(Toll Free)from au phones

      0077-7-111(Toll Free)

      about Internet services
      Contract / Fee / Billing

      0077-7084(Toll Free)

      Connection setting / failure

      0077-777(Toll Free)