MIVE Casema
Pearl White
- Pearl White
- Indigo Black
NEW
Japan Premier。※1
It looks like a flip phone, but it's actually a smartphone.
New customers
Contact us by phone
(Free call)0120-989-970
9:00-18:00 [Open all year round]
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.
Fee (terminal + SIM)
Total payment amount example
Set discount (J:COM MOBILE) *1 Apply
Smartphone 10GB (Date Mori applied *2 (those who 6 months
Monthly fee: 1,300 yen (1,430 yen including tax)
7th month onwards: 2,580 yen (2,838 yen including tax)
[Voice call + data communication]
6 months
500 yen per month (550 yen including tax)
(From the 7th month onwards, 1,958 yen including tax)
[For 48 installment payments]
800 yen per month
(880 yen including tax)
Starting in June 2026, the monthly fees for J:COM MOBILE A Plan ST/SU will be revised. For more information, click here.
- Click here for the conditions for applying for the set discount (J:COM MOBILE)
- Click here for the applicable conditions for Date Mori
- If you apply for a new "J:COM MOBILE A Plan ST 5GB" and "MIVE Casema" at the same time, and the Date Mori and set discount (J:COM MOBILE) are applied.
- 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. 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.
Set discount: 10GB for 6 months for 550 yen/month
Terminal charge
| 24 installments | 1,600 yen per month (1,760 yen including tax) |
|---|---|
| 48 times payment | 800 yen per month (880 yen including tax) |
| bulk | 38,400 yen (42,240 yen including tax) |
- Cash price/installment price: 38,400 yen (42,240 yen including tax)
- Installment payments: 1,600 yen (1,760 yen including tax)/month x 24 installments (24-month payment period, effective annual rate 0%) / 800 yen (880 yen including tax)/month x 48 installments (48-month payment period, effective annual rate 0%)
- If you cancel midway through the contract, you can pay the remaining installments in one lump sum or in installments.
monthly fee
6 months
(1,078 yen including tax)
(1,408 yen including tax)
(1,628 yen including tax)
(1,958 yen including tax)
(550 yen including tax)
(2,178 yen including tax)
(2,508 yen including tax)
(1,100 yen including tax)
(2,728 yen including tax)
(3,058 yen including tax)
(1,650 yen including tax)
50GB
(3,828 yen including tax)
(3,828 yen including tax)
(2,750 yen including tax)
50GB
(1,078 yen including tax)
(1,628 yen including tax)
(2,178 yen including tax)
(2,728 yen including tax)
(3,828 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)
(6 months)
(550 yen including tax)
(1,100 yen including tax)
(1,650 yen including tax)
(2,750 yen including tax)
- The discount rate will continue even after June 1, 2026. After the discount period ends, a new discount rate will be applied.
The conditions for applying the set discount (J:COM Mobile) arehere
- In conjunction with this change, the optional "nuisance call and message blocking" service will be offered free of charge from June. For more information, click here.
| Data Carryover | Any unused data will be used the following month. Automatically carry over |
|---|
| Voice calls (Domestic calls) |
Unlimited calls (5 minutes/call)
500yen Unlimited calls (60 minutes/call)
1,500yen Domestic calls: 20 yen (22 yen including tax)/30 seconds |
|---|
- Separate charges apply for the broadband universal service fee, telephone universal service fee, telephone relay service fee, call charges, SMS communication charges, etc.
- The monthly fee will be the price after the set discount (J:COM MOBILE) is no longer applied.
- 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.
- For eSIM (A Plan SU), this only applies if J:COM personal ID and subscriber ID are the same.
Set discount: 10GB for 6 months for 550 yen/month
Unlimited calls pack
Unlimited calls and data capacity
Combine this amount!
Easy ♪ pack
1,480 yen per month
(1,628 yen including tax)
From June 2026 onwards
Monthly fee: 1,780 yen (1,958 yen including tax)
Data capacity 5GB*
Unlimited calls (5 minutes / time)
Perfect ♪ pack
1,980 yen per month
(2,178 yen including tax)
From June 2026 onwards
Monthly fee: 2,280 yen (2,508 yen including tax)
Data capacity 10GB*
Unlimited calls (5 minutes / time)
Starting in June 2026, the monthly fees for J:COM MOBILE A Plan ST/SU will be revised. For more information, click here.
When applying the data Date Mori, 1GB becomes 5GB, and 5GB becomes 10GB. Click here for the applicable conditions.
It is also possible to combine Unlimited calls with other data capacities.
MIVE Casema
Features
Features
1
Large buttons make operation easy, and the outer display makes notifications easy to understand.
The phone-like physical keyboard and touchscreen make it easy to use, even for first-time smartphone users. The outer sub-display clearly displays notifications such as incoming calls, messages, and the time, so you can quickly check the information you need without opening your smartphone.
Features
2
You can also enjoy LINE※2and videos, and communicate with family and friends.
You can use apps like LINE and YouTube. Basic operations and text input can be done with the physical keys, so even feature phone users can operate it in the same way as before, and can exchange messages and make calls on LINE without any hesitation. You can also enjoy video apps, further enhancing communication with family and friends.
Features
3
A reliable SOS function that allows you to contact someone immediately in an emergency and even send your location information.
Simply press and hold the SOS button for at least 5 seconds to automatically send a message with location information to pre-registered people. This is a reassuring monitoring function that can immediately notify your exact current location in the event of an emergency. This is a reliable smartphone that provides solid support for safety.
If you are considering signing up or adding services
Sign Up information
New customers
Contact us by phone
(Free call)0120-989-970
9:00-18:00 [Open all year round]
spec
-
4.3 inches
-
195g
-
2,100mAh
-
Waterproof/Dustproof
| Model name | MIVE Casema |
|---|---|
| External dimensions (mm) | H127.8 × W65.3 × D16.2mm |
| Mass (main body) | 195g |
| standby time | 240 hours |
| OS version | Android 14 Go edition |
| CPU | MT6765X 2.2GHz x 4 + 1.6GHz x 4 |
| Memory (ROM) *3 | 32GB |
| Memory (RAM) *3 | 3GB |
| Display (size) | 4.3 inches |
| Display (resolution) | WVGA |
| Out camera (standard camera) | 8M |
| In-camera (standard camera) | 5M |
| Communication standard | 4G LTE |
| Wi-Fi standard | 2.4GHz: IEEE802.11b/g/n 5GHz: IEEE802.11a/n/ac |
| Tethering | correspondence |
| Waterproof/dustproof *4 | IP54 |
| MIL standard *5 (shock resistance) | Equivalent to MIL-STD-810G |
| microSDXC™ maximum capacity | 1TB |
| Bluetooth version | 5.4 |
| battery capacity | 2,100mAh |
| Earthquake early warning | correspondence |
| accessories | SIM PIN, User Manual, Hand Strap |
nationwide area
comfortable communication
Because it is an au line
available nationwide *6
with clear voice calls
easy to hear
It supports higher frequencies than conventional smartphones, and is easy to hear with clear voice.
Highly secure Wi-Fi
Free to use
As a perk, you can use highly secure public wireless LAN (Wi-Fi) for free. It also comes with VPN protection, so you can use free Wi-Fi with peace of mind. It's convenient because it saves on data charges when downloading large-volume apps on the go.
Apps that can use public wireless LAN (Wi-Fi)
"Giga elephant Wi-Fi"
tethering is
Free to use! *8
Even if you don't have a mobile Wi-Fi router, you can use your PC or game console to connect to the Internet regardless of whether you're indoors or outdoors.
accessories
(option)
MIVE Casema dedicated desktop holder (cable included)
Desktop Holder
- [Size (approx.)] W73.8 x H93.3 x D80mm
- [Weight (approx.)] 200g
- [Rated input] 5V/2A
- [Rated output] 5V/1A
- [Charging type] Pogo pin(2pins)
- [USB connection port] C type
- USB Type-A to Type-C cable included
- AC adapter not included
Smartphone AC adapter and cable set
Smartphone Cables
- [Supported output] Maximum 60W (20V/3A MAX)
- ［Length］ 1.0m
Smartphone AC adapter
- [Input] 100-240V~0.8A 50/60Hz
[Output] USB-C output: (30W PD) DC 5V 3A / 9V 3A / 12V 2.5A / 15V 2A / 20V 1.5A (max. 30W), (PPS) 3.3V-11V 2.7A (max. 30W), USB-A output: 5V 3A / 9V 2A / 12V 1.5A (maximum 18W), USB-C+USB-A output: 5V 3A (total maximum 15W)
[Maximum output] 30W - [Size (approx.)] W38.5×H32.5×D35mm
- [Weight (approx.)] 58g
Smartphone AC adapter
Smartphone AC adapter
- [Input] 100-240V~0.8A 50/60Hz
[Output] USB-C output: (30W PD) DC 5V 3A / 9V 3A / 12V 2.5A / 15V 2A / 20V 1.5A (max. 30W), (PPS) 3.3V-11V 2.7A (max. 30W), USB-A output: 5V 3A / 9V 2A / 12V 1.5A (maximum 18W), USB-C+USB-A output: 5V 3A (total maximum 15W)
[Maximum output] 30W - [Size (approx.)] W38.5×H32.5×D35mm
- [Weight (approx.)] 58g
accessories (optional)
Price list
| Installment payment | Lump sum payment | |
|---|---|---|
| microSDXC card (128GB) | 400 yen/month (440 yen/month including tax) |
9,600 yen (10,560 yen including tax) |
| MIVE Casema dedicated desktop holder (cable included) | 150 yen/month (165 yen/month including tax) |
3,600 yen (3,960 yen including tax) |
| Smartphone AC adapter and cable set | 150 yen/month (165 yen/month including tax) |
3,600 yen (3,960 yen including tax) |
| Smartphone AC adapter | 100 yen/month (110 yen/month including tax) |
2,400 yen (2,640 yen including tax) |
Accessories for J:COM MOBILE and J:COM Tablet can be purchased at any time.
Click here for accessory price list (for additional purchases)
Accessories can be purchased not only when you first purchase your smartphone, but also later.
Information on purchasing additional accessoriesIf you wish to purchase additional items at a later date, you will need to apply by phone. Also, the price may differ from the price at the time of your initial purchase.
And many more!
Safe and convenient option
When using MNP
When using MNP *1
- Depending on the mobile phone company you currently have a contract with, you may be able to complete the procedure without needing to enter an MNP reservation number.
- If your contracted mobile phone company is not eligible for One Stop, you will need to obtain an MNP reservation number from your current contracted mobile phone company. Click here for information on how to obtain one.
- An MNP reservation number with an expiration date of 10 days or more is required at the time of application. If the expiration date is less than 10 days, you will need to reacquire the MNP reservation number.
- About MNP
- Some phone numbers may not be available.
- There may be cases where the email address you used before switching cannot be used, or where data transfer is required to continue using the apps you are currently using.
When not using MNP
- We will give you a new phone number. *2
- You cannot choose the number. Changing the phone number requires an additional fee.
FAQ
Procedures such as contracting and changing models are cumbersome.
You can easily apply online. Visiting support is also available upon request.
You can apply for J:COM MOBILE online. You can complete the process from the comfort of your own home, so there is no need to go to a store and wait for a long time.
Once you receive your smartphone, you can receive free support if you wish. We will provide detailed instructions on how to use your smartphone, as well as the initial settings.
Can you issue a receipt?
Please refer to the link below for details on the initial costs incurred at the time of contract.
I want to know about support after joining
We offer a wide range of contact methods, from inquiries by phone or chat to guidance on our homepage with support information. In addition, by subscribing to Enkaku Support (550 yen per month (tax included)), you can receive remotely operated support from an operator.
Where can I check what plan I have?
You can check the plan you are subscribed to with J:COM MOBILE on My Page.
Where can I see my call details?
You can check your J:COM MOBILE call details on My Page.
I want to transfer data such as my phone book to a new smartphone, what should I do?
Solve difficult settings at home. Leave the initial settings of your smartphone to Enkaku Support!
J:COM MOBILE provides free support that provides detailed instructions on initial settings, migration of phonebook data, instructions on how to use the service, etc. for those who wish to do so.
Can I continue to use the email address I'm currently using on my J:COM MOBILE smartphone?
If you are using a free email service such as Gmail, you can continue to use it by logging in or setting up a new device.
Please note that if you are using an email address (domain) issued by some telecommunications companies, you will not be able to use it.
- There are some services that allow you to continue using carrier mail even after canceling your carrier. Please refer here for details.
J:COM MOBILE does not issue email addresses, so we recommend that you switch to a free email such as G-mail in advance.
Can I carry over unused data usage?
Unused data traffic will be automatically carried over to the next month.
*The remaining amount is valid until the end of the following month.
If the upper limit is exceeded, the speed will be limited to 1Mbps or 200kbps depending on the plan you subscribe to. In addition to the data usage of your contract plan, you can also carry over any additional data usage you purchase to the next month.
Please check here for more information, including expiration dates.
Can I continue to use LINE on my new device?
By completing the appropriate settings and procedures, you can continue to use the service on your new device.
Regarding account migration (handover) procedures, security is regularly strengthened, so please check the latest information on LINE's official blog before proceeding.
(*Please note that settings may be required before changing the model)
[Notes]
- ALT is selling smartphone devices for the first time in Japan.
- Separate installation required. "LINE" is a trademark or registered trademark of LINE Yahoo! Corporation.
- The entire capacity of the built-in memory (RAM/ROM) cannot be used to store apps, data, etc.
- [Waterproof performance] Compliant with IPX4. [Dustproof performance] Compliant with IP5X.
- The manufacturer's own testing is conducted in accordance with MIL-STD-810G established by the US Department of Defense. However, this does not guarantee protection against all impacts.
- Available in au's 4G LTE area. 3G communication is not available. Depending on the usage environment, communication may not be possible or communication speeds may be slow. For details, please visit the au website.
- High quality voice calls between au VoLTE compatible models (within au's 4G LTE area), and conventional voice quality calls between other models. The actual voice quality may vary depending on the radio wave environment and line congestion.
- Data communication amount during tethering connection is counted as J:COM MOBILE communication amount.
[About sales equipment (J:COM MOBILE)]
<MIVE Casema (AT-M140J)>
- Specifications: [OS] Android 14 Go edition, [Processor] MT6765X, [Operating frequency] 2.2GHz x 4 + 1.6GHz x 4, [RAM] 3GB, [ROM] 32GB. [External dimensions (approx.)] H 127.8 x W 65.3 x D 16.2mm, [Weight (approx.)] 195g.
<Common to each device>
- A contract with Plan A ST is required. In addition, the following terminal fee is required based on the contract conditions specified by JCOM Inc. The number of payments can be selected from 1, 24 (24-month payment period) or 48 (48-month payment period). The effective annual rate for installment payments is 0%. If you cancel the contract midway, you will still be required to pay the remaining installment payments.
<Device price for MIVE Casema (AT-M140J)>
- 38,400 yen (42,240 yen including tax) (24 installments: 1,600 yen (1,760 yen including tax) per installment, 48 installments: 800 yen (880 yen including tax) per installment).
[Indication based on the Act on Specified Commercial Transactions regarding sales equipment]
- Cooling off: 1. If you notify us in writing or by electromagnetic record within 8 days from the date of receipt of the "Contract Contents Guide (Post-contract Document)" provided by our company, you may cancel the sales contract and service contract for this device (excluding telephone charges and SMS communication charges). In that case, you must provide the date of application, product name, cash sales price, sales company (listed at the beginning of the Post-contract Document), your address, and your name. 2. If the device has already been delivered to you, we will cover the cost of picking up the device.
- Responsibility of the seller: Contact J:COM for initial defects (within 10 days from the date of delivery). <iPhone (genuine product)> The free warranty period is 12 months from the date of registration of the device with Apple. For repairs and replacements in the event of a natural breakdown during the free warranty period, contact an Apple Store, Apple's call center, or Apple's official website. <au Certified iPhone (certified used product)> The free warranty period is 30 days from the date of delivery of the device. For repairs and replacements, contact J:COM. This product is not covered by Apple Care+ for iPhone, which is provided by Apple. <Android devices (excluding Google Pixel 8a)> The free warranty period is 12 months from the date of delivery of the device. For repairs and replacements, contact J:COM. <Google Pixel 8a> The free warranty period is 1 year from the date the device is connected to the network. For repairs and replacements during the free warranty period, contact Google's official website. If you have subscribed to the Secure Device Warranty 60, contact J:COM.
- If you request it, we will send you a separate document or electronic data containing the full text of the notice based on the Specified Commercial Transactions Act.
[About sales products (accessories)]
The purchase price of accessories will be billed together with the monthly J:COM service usage fee. Sales will end when stock runs out.
＜SanDisk Ultra microSDXC™ UHS-I Card 128GB＞
- Specifications: [Speed class] C10, U1, A1 [Maximum read speed (transfer)] 140MB/s, [Size (approx.)] W15.0 x H11.0 x D1.0mm, [Weight (approx.)] 0.4g
<MIVE Casema Accessories>
- Desktop holder (AT-C141J): [Size (approx.)] W73.8 x H93.3 x D80 mm [Weight (approx.)] 200 g [Rated input] 5 V/2 A [Rated output] 5 V/1 A [Charging type] Pogo pin (2 pins) [USB connection port] C type
<Smartphone cable>
- [Supported output] Maximum 60W (20V/3A MAX)
- ［Length］ 1.0m
<AC adapter for smartphones>
- [Input] 100-240V~0.8A 50/60Hz
[Output] USB-C output: (30W PD) DC 5V 3A / 9V 3A / 12V 2.5A / 15V 2A / 20V 1.5A (max. 30W), (PPS) 3.3V-11V 2.7A (max. 30W), USB-A output: 5V 3A / 9V 2A / 12V 1.5A (maximum 18W), USB-C+USB-A output: 5V 3A (total maximum 15W)
[Maximum output] 30W - [Size (approx.)] W38.5×H32.5×D35mm
- [Weight (approx.)] 58g
<Common to each product>
- The product price listed below is required based on the contract conditions set by JCOM Inc. Payment can be made in one or 24 installments (24-month payment period). The effective annual rate for installment payments is 0%. If the contract is terminated midway, the remaining installment payment for the remaining period must be paid in a lump sum. The payment timing and method will be in accordance with the invoice from J:COM.
- Commodity price:
- <microSDXC card (128GB)>
9,600 yen (10,560 yen including tax) (400 yen when divided (440 yen including tax)/time) - <Dedicated desktop holder for MIVE Casema (cable included)>
3,600 yen (3,960 yen including tax) (150 yen (165 yen including tax) per installment) - <Smartphone AC adapter and cable set>
3,600 yen (3,960 yen including tax) (150 yen (165 yen including tax) per installment) - <AC adapter for smartphones>
2,400 yen (2,640 yen including tax) (100 yen (110 yen including tax) per installment)
- <microSDXC card (128GB)>
[Information regarding products sold based on the Specified Commercial Transactions Act]
- Cooling off: 1. You may cancel the sales contract for this product by notifying us in writing or by electromagnetic record within 8 days from the date of receipt of the "Contract Contents Guide (Post-Contract Document)" provided by our company. 2. If the product has already been delivered to you, we will cover the cost of picking up the product.
- Responsibility of seller: The seller's responsibility for defects and breach of contract regarding this product is limited to the warranty provided by the manufacturer of this product.
- If you request it, we will send you a separate document or electronic data containing the full text of the notice based on the Specified Commercial Transactions Act.
[About 5G communication]
- 5G is provided in some areas. For details, visit the au homepage.
- A 5G-compatible device is required to use this service.
- D Plan does not offer 5G.
- "LINE" is a trademark or registered trademark of LINE Corporation.
- SanDisk, the SanDisk logo, and SanDisk Ultra are trademarks or registered trademarks of SanDisk Corporation in the United States and other countries.
- The SD and microSDXC marks and logos are trademarks of SD-3C, LLC.
- Company names, product names, and service names are registered trademarks or trademarks of each company. Including some pending applications.
[About the amount including tax]
- Consumption tax differences may occur due to changes in the consumption tax rounding method under the invoice system.
