A great deal for your family to enjoy when your child gets their first smartphone: 10GB for just 550 yen/month
Won two awards for communication quality satisfaction
- Source: MMD Research Institute's "September 2025 MVNO Market Share and Satisfaction Survey." A survey of main users (150 people each) of seven low-cost smartphone companies, comparing satisfaction scores for communication quality. Survey period: September 12th to September 21st, 2025.
monthly fee
I can use 5GB of data.
1,280 yen /month (1,408 yen including tax)
(1,408 yen including tax)
(1,958 yen including tax)
(2,508 yen including tax)
(3,058 yen including tax)
(3,828 yen including tax)
| Data Carryover | Any unused data will be used the following month. Automatically carry over |
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| Block nuisance calls and messages |
attention! free *Settings in the app are required to start using the service. |
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| Voice calls (domestic calls) |
Unlimited calls (5 minutes/call) 500yen (550 yen including tax) Unlimited calls (60 minutes/call) 1,500yen (1,650 yen including tax) Domestic calls: 20 yen (22 yen including tax)/30 seconds |
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- With Date Mori, 1GB will be increased to 5GB, 5GB will be increased to 10GB, 10GB will be increased to 20GB, 20GB will be increased to 30GB, and 50GB will be increased to 60GB. See here for applicable conditions.
- Separate charges apply for the broadband universal service fee, telephone universal service fee, telephone relay service fee, call charges, SMS communication charges, etc.
- A contract administration fee of 3,000 yen (3,300 yen including tax) is required (excluding A Plan SU). However, if you sign up for other J:COM services at the same time, the contract administration fee for J:COM MOBILE may be waived.
Overview of Date Mori
- Eligibility is automatically applied.
- Applies to the whole family.
- Surplus data capacity can be carried over.
- eSIM（AプランSU）では、対象J:COMサービスのパーソナルID(契約者ID)と同一IDでご契約いただく回線のみデータ盛が適用。
＼Simple check of basic monthly fee and terminal fee／
Smartphone savings calculator
Mobile phones for kids
Choose your favorite device
Recommended devices are here
iPhone
Android
If you want to make it even cheaper
Cheap SIM
You can switch to a low-cost SIM by replacing the SIM card in the smartphone your family uses.
Advantage 1: No device fee
Since there is no charge for the device, initial costs can be kept low.
Advantage 2: Easy to teach how to operate
Smartphones that parents no longer use can continue to be used by children.
You can rest assured that you won't have to worry about how to operate it.
Safe and secure security and warranty service!
I'm afraid my child will become a victim of fraud.
Your phone gets lost or damaged...
You don't have to worry about that with J:COM!
J:COMで契約したスマホ以外
でも補償対象に
The more devices you have, the better the deal, so we recommend signing up for the whole family!
The monthly payment is 680 yen for two devices. After that, you can pay 200 yen for each additional device, so the more family members you sign up for, the more you save!
Automatically warn of dangerous calls and SMS
Block dangerous SMS and malicious nuisance calls!
It protects your children from being directed to sites containing harmful information via SMS containing URLs, and from nuisance phone calls that attempt to trick them into giving out their personal information for misuse.
Peace of mind in case of an emergency!
Comprehensive warranty service
In the event of damage, we will deliver a replacement device at a low cost with just one phone call.
- お子さまを危険なサイトやアプリから守るために、フィルタリングサービスのご利用をお願いいたします。設定方法について詳しくはこちら
