2026年 April

10 Best prepaid in 日本

Last Updated - 02/04/2026

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Best Choice
01

KNTBROS

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On Amazon

Docomo Prepaid SIM Unlimited 30 Days Japanese SIM Prepaid Data Only / SIM Card Japan unlimited prepaid
9.8

Exceptional

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.
Main highlights

【docomo's MVNO line】You can use the prepaid SIM with unlimited capacity as long as it is within the validity period No daily limit Tethering is also available
【No identity verification, disposable type】No troublesome procedures such as credit cards or bank accounts You can use it on the same day you receive it if you configure the APN settings For use within Japan, please use this product with a device that has a Technical Standards Compliance mark
【Capacity/Duration】 Unlimited / 30 days after APN setup, exclusive for Japan
[Trilingual Help Desk Support] We have a 365-day phone support service in Japanese, English, and Chinese for those temporarily returning to Japan and foreign visitors to Japan The instructions included with the product have the phone number listed
Activation Period: Activation by February 28, 2026 Usable for 30 days from activation

￥3,590
Best Value
02

KNTBROS

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Docomo Prepaid SIM Unlimited 30 Days Japanese SIM Prepaid Data Only / SIM Card Japan unlimited prepaid
9.6

Exceptional

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.
Main highlights

【docomo's MVNO line】You can use the prepaid SIM with unlimited capacity as long as it is within the validity period No daily limit Tethering is also available
【No identity verification, disposable type】No troublesome procedures such as credit cards or bank accounts You can use it on the same day you receive it if you configure the APN settings For use within Japan, please use this product with a device that has a Technical Standards Compliance mark
【Capacity/Duration】 Unlimited / 30 days after APN setup, exclusive for Japan
[Trilingual Help Desk Support] We have a 365-day phone support service in Japanese, English, and Chinese for those temporarily returning to Japan and foreign visitors to Japan The instructions included with the product have the phone number listed
Activation Period: Activation by February 28, 2026 Usable for 30 days from activation

￥3,590
03

bigconnect

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Japan Prepaid SIM 360 Days 20 GB Large Capacity Rakuten 5G 4G LTE Compatible Prepaid SIM Card for Japan Domestic SIM Rakuten Prepaid SIM Prepaid SIM Dedicated Data Japan Prepaid SIM 5G 4G LTE Prepaid
9.5

Excellent

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.
Main highlights

[Strongest Rakuten Plan] Data dedicated SIM card uses Rakuten network and supports 5G prepaid too! 4G and LTE are also available. When using a Prepaid SIM card, you will need a SIM free smartphone or tablet that has been unlocked to the device. Not compatible with SIM locked devices. The transmission speed may differ depending on the device used
Phone calls using the app: You cannot use the phone number, but you can also use the LINE or Skype voice calls. Use PLU TO GO SIM card (insert SIM and start communication immediately)
Japanese Customer Support: We offer customer support in Japanese, English, and Chinese, which is safe for those who temporarily return to Japan, teleworkers, and foreign visitors
Expiration Date: Final start date: December 31, 2025. The data capacity can be up to 20 GB within the expiration date of the SIM card. When 20GB of data runs out, the communication will stop. (Usage Period: 360 days from the date that the SIM card is inserted and set the data. ) and high-speed data transmission up to 10GB. When the month use exceeds 10GB, the maximum communication speed will be reduced to 256 kbps until the end of the month (this slow speed data is not included in the 20GB plan, it is unusable). The speed limit will be automatically released on the next day of the month. In addition, if the data is used for a total of 20 GB, the communication will be stopped
(High Standard Communication Quality) Among the 4 major carriers, it has earned the highest communication quality in the industry in the widest region. Rakuten Mobile has continuously improved communication quality. The frequency band is compatible with [5G] Band1, [4G] Band1, Band3, Band8. *Please use this SIM card on devices that do not have SIM lock. Please note that it cannot be used with SIM locked devices
(Disposable, No Need to Confirm Identity) No complicated procedures such as credit cards or bank accounts required. Simply set the APN on the day you receive it and use it

￥2,680
04

bigconnect

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On Amazon

[Japan sim] Japan Prepaid SIM 360 Days 20 GB Large Capacity Genuine Rakuten Carrier Use Prepaid SIM Card for Japan SIM Card Prepaid SIM Prepaid Data Only 4 GLTE Compatible (360 Days 20GB (Rakuten
9.3

Excellent

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.
Main highlights

[Strongest Rakuten Plan] Data dedicated SIM card uses Rakuten network and supports 5G prepaid too! 4G and LTE are also available. When using a Prepaid SIM card, you will need a SIM free smartphone or tablet that has been unlocked to the device. Not compatible with SIM locked devices. The transmission speed may differ depending on the device used
Phone calls using the app: You cannot use the phone number, but you can also use the LINE or Skype voice calls. Use PLU TO GO SIM card (insert SIM and start communication immediately)
Japanese Customer Support: We offer customer support in Japanese, English, and Chinese, which is safe for those who temporarily return to Japan, teleworkers, and foreign visitors
Expiration Date: Final start date: May 31, 2025. Please start using this product within the expiration date. The high speed data capacity can be used up to 20 GB. When the high speed 20GB data runs out, the communication will stop. (Usage Period: 360 days from the date that the SIM card is inserted and set the data. ) and high speed data transmission up to 10GB. When the month use exceeds 10GB, the maximum communication speed will be reduced to 256 kbps until the end of the month (this slow speed data is not included in the 20GB plan, it is unusable). The speed limit will be automatically released on the next day of the month. In addition, if the data is used for a total of 20 GB, the communication will be stopped
(High Standard Communication Quality) Among the 4 major carriers, it has earned the highest communication quality in the industry in the widest region. Rakuten Mobile has continuously improved communication quality. The frequency band is compatible with [5G] Band1, [4G] Band1, Band3, Band8
(Disposable, No Need to Confirm Identity) No complicated procedures such as credit cards or bank accounts required. Simply set the APN on the day you receive it and use it

￥2,680
05

bigconnect

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【Japan SIM】Japan Prepaid SIM 10GB Large Capacity Rakuten Carrier Use Prepaid SIM Card for Japan Domestic Use SIM Card Prepaid SIM Prepaid Data Only 4G LTE Compatible (360 Days 10GB (Rakuten Line))
9.1

Excellent

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.
Main highlights

【Rakuten Carrier】A data-only SIM card that uses the Rakuten network and supports 5G even with prepaid! 4G and LTE are also available ※When using a prepaid SIM card, a SIM-free (SIM unlock completed) smartphone or tablet is required Cannot be used on devices with SIM lock ※Communication speed may vary depending on the device used
【No activation deadline】You can use up to 10GB of high-speed data capacity Usage Period: 360 days from the first day of data communication after the SIM card is inserted, configured, and activated There is no limit to the amount of communication per day, but you can use it up to the data capacity limit without restriction. * Communication will stop if it exceeds 360 days or 10 GB
【Japanese Customer Support】We provide year-round customer support in Japanese, English, Chinese, and Korean for those temporarily returning to Japan, working remotely, and foreign visitors to Japan
【App-based Calling】While voice calls using a phone number are not possible, voice calls using LINE or Skype are available Use PLU TO GO's SIM card (communication starts immediately upon inserting the SIM)
No Contract Required: No contract required, no complicated procedures such as credit cards or bank accounts Simply set up the APN on the day it arrives and it's ready to use.' Frequency bands supported: [5G] Band 1, [4G] Band 1, Band 3, Band 8

￥1,930
06

KNTBROS

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On Amazon

Docomo Prepaid SIM Japan 25GB 90 Days sim Prepaid Data Only 4G LTE Physical SIM/prepaid sim 25GB 90days Japan Travel (25GB/90 Days)
9.0

Excellent

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.
Main highlights

【Stable communication with docomo network】As long as it is within the validity period of the prepaid SIM, you can use up to 25GB of docomo's 4G LTE high-speed data capacity Coverage area and speed are stable, and tethering is also available
【No identity verification required, disposable type】No troublesome procedures like credit cards or bank accounts You can use it the same day you receive it if you configure the APN settings For use within Japan, please use with a device that has a Technical Standards Compliance mark
【Multi-language support help desk】We provide a 365-day support help desk in Japanese, English, and Chinese for those temporarily returning to Japan or foreign visitors The included instructions have the phone number listed
【Includes SIM Pin】For use with IP in Japan
Compatible with SIM-free routers other than smartphones if they support the following frequency bands【Supported bands】band1, band3, band19 *All three need to be supported
Capacity/Days: 25 GB, available at a low speed of 32 kbps after the capacity is exceeded; 90 days after APN settings
Activation Period: Must be activated by April 30, 2026 Can be used for 90 days after activation

￥3,280
07

KNTBROS

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On Amazon

Docomo Prepaid SIM Japan 25GB 90 Days sim Prepaid Data Only 4G LTE Physical SIM/prepaid sim 25GB 90days Japan Travel (25GB/90 Days)
8.9

Very Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.
Main highlights

【Stable communication with docomo network】As long as it is within the validity period of the prepaid SIM, you can use up to 25GB of docomo's 4G LTE high-speed data capacity Coverage area and speed are stable, and tethering is also available
【No identity verification required, disposable type】No troublesome procedures like credit cards or bank accounts You can use it the same day you receive it if you configure the APN settings For use within Japan, please use with a device that has a Technical Standards Compliance mark
【Multi-language support help desk】We provide a 365-day support help desk in Japanese, English, and Chinese for those temporarily returning to Japan or foreign visitors The included instructions have the phone number listed
【Includes SIM Pin】For use with IP in Japan
Compatible with SIM-free routers other than smartphones if they support the following frequency bands【Supported bands】band1, band3, band19 *All three need to be supported
Capacity/Days: 25 GB, available at a low speed of 32 kbps after the capacity is exceeded; 90 days after APN settings
Activation Period: Must be activated by April 30, 2026 Can be used for 90 days after activation

￥3,280
08

bigconnect

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On Amazon

【SIM for Japan】SIM for Japan Domestic Use 360 Days 10GB Prepaid SIM SIM Card Rakuten Carrier Data Communication Only No Contract Required SIM Pin Included Multi-Language Support (Japanese, English
8.7

Very Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.
Main highlights

【Rakuten Carrier】A data-only SIM card that uses the Rakuten network and supports 5G even with prepaid! 4G and LTE are also available ※When using a prepaid SIM card, a SIM-free (SIM unlock released) smartphone or tablet is required Cannot be used on devices with SIM lock ※Communication speed may vary depending on the device used
【No contract required】No need for activation or setup procedures for prepaid sim, no contract required, no need for complicated procedures such as credit cards or bank accounts Just set up the APN on the day you receive it and it will be ready to use Frequency bands supported: [5G] Band 1, [4G] Band 1, Band 3, Band 8 Please note: Avoid strong contact with fingers or nails on the IC chip part If damaged, it cannot be used
【No activation period】Up to 10GB of high-speed data capacity is available Usage Period: 360 days from the first day of data communication after the SIM card is inserted and configured There is no limit to the amount of communication per day, but you can use it up to the data capacity limit without restriction. * Communication will stop if it exceeds 360 days or 10GB
【Japanese Customer Support】We provide year-round, 24/7 customer support in Japanese, English, Chinese, and Korean for those temporarily returning to Japan, working remotely, and foreign visitors to Japan
【App-based calls】You cannot make calls using a phone number, but voice calls using LINE or Skype are possible Use the PLU TO GO SIM card (insert the SIM to start communication immediately)

￥1,930
09

bigconnect

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On Amazon

Japan Prepaid SIM 360 Days 10GB High Capacity Rakuten 5G 4G LTE Compatible Prepaid SIM Card for Japan Domestic Use SIM Card Rakuten Prepaid SIM Prepaid Data Only Japan Prepaid SIM 5G 4G LTE Prepaid
8.6

Very Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.
Main highlights

【Validity Period】Final start date of use: 1 year from the date of purchase ※Please start using it within the usage period As long as the SIM card is within its validity period, you can use up to 10GB of high-speed data capacity Usage Period: From the day the SIM card is inserted, configured, and data communication is first performed, it is 360 days There is no limit to the amount of communication per day, but you can use it up to the data capacity limit without restriction * The data communication volume is subject to the SIM card limit
【Strongest Rakuten Plan】A data-only SIM card that uses the Rakuten network and supports 5G even with prepaid! 4G and LTE are also available ※When using a prepaid SIM card, a SIM-free (SIM unlock completed) smartphone or tablet is required Cannot be used on devices with SIM lock ※Communication speed may vary depending on the device used
【Japanese Customer Support】We provide year-round Japanese, English, and Chinese customer support for those temporarily returning to Japan, working remotely, and foreign visitors to Japan with peace of mind
【High Communication Quality】Among the 4 major carriers, we have achieved the highest industry standard communication quality in the most extensive areas Rakuten Mobile is continuously improving communication quality Frequency bands supported: [5G] Band 1, [4G] Band 1, Band 3, Band 8 Please use this SIM card on devices that do not have SIM lock Please note that it will not work with SIM locked devices
【App-based calls】While voice calls using a phone number are not possible, voice calls using LINE or Skype are available Use the PLU TO GO SIM card (communication starts immediately upon inserting the SIM)
(Disposable Type, No Identification Required) No complicated procedures such as credit cards and bank accounts required Simply set the APN on the day of arrival to start using it

￥1,930
10

LE WANG TONG ENTERPRISE

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On Amazon

SoftBank SIM Data Capacity 10GB Prepaid SIM Soft Bank Data Dedicated SIM Card 4G LTE Prepaid SIM 10GB Japan Travel Japan with SIM PIN SOFTBANKSIM Japan SIM Japan Prepaid SIM
8.5

Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.
Main highlights

【Attention Required】There have been many inquiries about the issue where the data amount stops at 2GB with a remaining usage period of one month. The cause is often due to the default data limit setting on the device where the SIM is inserted, which is set to 2GB for one month In that case, to prevent high charges, communication will be stopped on the smartphone side, so please change the data limit setting value or turn it OFF 【Balance Check】You can check the balance using the QR code listed in the manual However, please note that once the limit of 10GB is exceeded, it will no longer be possible to confirm it, so please check it as appropriate
● You can use up to 10GB of data capacity as long as the SIM is within its validity period Once the 10 GB is used up, communication will stop Overseas roaming cannot be used outside of Japan
● SIM card validity: until May 20, 2026
● SIM Size: Compatible with standard, micro, and nano sizes ● Tethering available
● Frequency Band 【4G】Band 1 2,100 MHz, Band 3 1,700 MHz, Band 8 900 MHz * It is necessary to support all three frequency bands Since you will be unable to use it if even one frequency band is missing and it goes out of range, please confirm the frequency bands of the device you plan to use Depending on the device you use, there may be cases where it cannot be used or the communication speed becomes slower due to the cause of the built-in frequency
● Exclusively for data communication (SMS/call usage is not possible) If you are using an IP phone that utilizes data communication such as LINE or Skype, then calls are possible
● Compatible with SIM free smartphones and tablets ●Cannot be used with SIM-locked devices ※Please note that we cannot guarantee the use of Wi-Fi routers
※ Period extension or data recharge is not possible
Includes a Japanese manual, SIM card removal pin, and SIM card storage case

￥1,980

10 Best prepaid in 日本

Docomo Prepaid SIM Unlimited 30 Days Japanese SIM Prepaid Data Only / SIM Card Japan unlimited prepaid

Docomo Prepaid SIM Unlimited 30 Days Japanese SIM Prepaid Data Only / SIM Card Japan unlimited prepaid

Japan Prepaid SIM 360 Days 20 GB Large Capacity Rakuten 5G 4G LTE Compatible Prepaid SIM Card for Japan Domestic SIM Rakuten Prepaid SIM Prepaid SIM Dedicated Data Japan Prepaid SIM 5G 4G LTE Prepaid

[Japan sim] Japan Prepaid SIM 360 Days 20 GB Large Capacity Genuine Rakuten Carrier Use Prepaid SIM Card for Japan SIM Card Prepaid SIM Prepaid Data Only 4 GLTE Compatible (360 Days 20GB (Rakuten

【Japan SIM】Japan Prepaid SIM 10GB Large Capacity Rakuten Carrier Use Prepaid SIM Card for Japan Domestic Use SIM Card Prepaid SIM Prepaid Data Only 4G LTE Compatible (360 Days 10GB (Rakuten Line))

Docomo Prepaid SIM Japan 25GB 90 Days sim Prepaid Data Only 4G LTE Physical SIM/prepaid sim 25GB 90days Japan Travel (25GB/90 Days)

Docomo Prepaid SIM Japan 25GB 90 Days sim Prepaid Data Only 4G LTE Physical SIM/prepaid sim 25GB 90days Japan Travel (25GB/90 Days)

【SIM for Japan】SIM for Japan Domestic Use 360 Days 10GB Prepaid SIM SIM Card Rakuten Carrier Data Communication Only No Contract Required SIM Pin Included Multi-Language Support (Japanese, English

Japan Prepaid SIM 360 Days 10GB High Capacity Rakuten 5G 4G LTE Compatible Prepaid SIM Card for Japan Domestic Use SIM Card Rakuten Prepaid SIM Prepaid Data Only Japan Prepaid SIM 5G 4G LTE Prepaid

SoftBank SIM Data Capacity 10GB Prepaid SIM Soft Bank Data Dedicated SIM Card 4G LTE Prepaid SIM 10GB Japan Travel Japan with SIM PIN SOFTBANKSIM Japan SIM Japan Prepaid SIM

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