2026年 April

10 Best sim cards in 日本

Last Updated - 02/04/2026

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Best Choice
01

bigconnect

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Japan Prepaid SIM 360Days 50GB Large Capacity Rakuten 5G 4G LTE Compatible Prepaid SIM Card for Japan Domestic Use Rakuten Prepaid SIM Prepaid Data Only (360 Days 50GB)
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

【Validity Period】Final use start date: 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 50GB of high-speed data capacity Once the high-speed data of 50 GB is used up, communication will stop Usage Period: 360 days from the first day of data communication after the SIM card is inserted and configured ) and up to 20GB high-speed data transmission per month If the usage for that month exceeds 20 GB, the maximum communication speed will decrease to 256 kbps until the end of the month (this low-speed data is not included in the 50 GB plan and is unlimited) The speed limit will be automatically lifted on the 1st of the following month Also, if you use up a total of 50 GB of high-speed data, communication will be stopped
【Strongest Rakuten Plan】A data-only SIM card that utilizes 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
【Japanese Customer Support】We provide year-round Japanese, English, and Chinese customer support for those temporarily returning to Japan, working remotely, or foreign visitors to Japan
【High Standard Communication Quality】Among the 4 major carriers, we have achieved the industry's highest standard communication quality in the widest area 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 a device that does not have SIM lock Please note that it will not work with SIM locked devices
【App-based calls】You cannot make calls using a phone number, but you can make voice calls using LINE or Skype 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 Just set up the APN on the day you receive it and it will be ready to use

￥4,880
Best Value
02

KNTBROS

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Docomo Prepaid SIM Unlimited 30 Days Japanese SIM Prepaid Data Only / SIM Card Japan unlimited prepaid
9.4

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

【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

KNTBROS

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Docomo Prepaid SIM Japan 25GB 90 Days sim Prepaid Data Only 4G LTE Physical SIM/prepaid sim 25GB 90days Japan Travel (25GB/90 Days)
9.3

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

【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
04

KNTBROS

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Docomo Prepaid SIM Japan 25GB 90 Days sim Prepaid Data Only 4G LTE Physical SIM/prepaid sim 25GB 90days Japan Travel (25GB/90 Days)
9.2

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
05

KNTBROS

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

【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
06

Nippon SIM

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Nippon SIM for Japan Prepaid Sim Card, 180 Days, 10 GB, Sim, Docomo Communication Network, For Data Communication, 4G, LTE, 3-in-1 (Standard/Micro/Nano), Sim Free, Compatible with Devices Only
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

【Setting Method】Remove the IC part of this SIM card and insert it into your device Android Devices: Set the APN information on your device iPhone/iPad: Just plug in a SIM card It is basically set to automatic configuration If it is not set automatically, please configure the APN according to the instructions in the manual If you use cheap SIMs, please delete the profile of the cheap SIM beforehand
【Final use start date: within 6 months of purchase】For use within Japan, please use with a device that has a Technical Standards Compliance Mark Please ensure to start using it by the expiration date Once the usage period is over, it will no longer be usable Usage Period: 180 days from the date of first data communication after inserting the SIM card and setting it up )
No troublesome contracts! Full Support: No need for activation, personal identification, credit card registration, contracts, or administrative fees DHA Corporation Co., Ltd. is a Japanese MVNO (Mobile Virtual Network Operator, notification number A-30-16419) We provide consistent support from sales to customer service, and offer support in Japanese/English/Chinese If you have any questions about the product or setup method, please feel free to contact us
High-speed communication with NTT Docomo network 180 days 10 GB high-speed communication on NTT Docomo's network with wide-area coverage Even after using up the purchased data capacity, it can be used at a maximum speed of 128 kbps for 180 days Compatible SIM Sizes: Can be switched between standard, micro, and nano sizes. Product Packaging: SIM card, SIM pin, multilingual manual (English language not guaranteed)
Compatible devices: Compatible with SIM-free iPhones/smartphones, Wi-Fi routers, tablets, 4G and LTE-compatible computers Tethering is available Compatible devices: iPhones, iPads, smartphones, mobile WiFi routers, tablets, LTE computers 【Supported Frequency Bands】4G/LTE: Band 1 (2.1GHz) / Band 3 (1.8GHz) / Band 19 (800MHz) / Band 21 (1.5GHz) / Band 28 (700MHz) / Band 42 (3.5GHz); 3G/W-CDMA: Band 1 (2.1GHz) / Band 6 (800MHz) / Band 19 (800MHz)

￥1,980
07

Nippon SIM

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Nippon SIM for Japan Prepaid Sim Card, 180 Days, 15 GB Sim, Docomo Communication Network, For Data Communication, 4G LTE 3-in-1 (Standard/Micro/Nano), Sim Free, Compatible with Devices Only
8.8

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

【Setting Method】Remove the IC part of this SIM card and insert it into your device Android Devices: Set the APN information on your device iPhone/iPad: Just plug in a SIM card It is basically set to automatic configuration If it is not set automatically, please configure the APN according to the instructions in the manual If you use cheap SIMs, please delete the profile of the cheap SIM beforehand
[Date of final usage: within 6 months of purchase] Please use a device with a technical standards mark when used in Japan Please ensure to start using it by the expiration date Once the usage period is over, it will no longer be usable Usage Period: 180 days from the date of first data communication after inserting the SIM card and setting it up Please start using the SIM before the expiry date printed on package in order to enjoy the full duration.
No troublesome contracts! Full Support: No need for activation, personal identification, credit card registration, contracts, or administrative fees DHA Corporation Co., Ltd. is a Japanese MVNO (Mobile Virtual Network Operator, notification number A-30-16419) We provide consistent support from sales to customer service, and offer support in Japanese/English/Chinese If you have any questions about the product or how to set it up, please feel free to contact us
High-speed communication with NTT Docomo network 180 days 15 GB high-speed communication on NTT Docomo's network with wide-area coverage Even if you use up the purchased data capacity, it can be used at a maximum speed of 128 kbps for 180 days Compatible SIM Sizes: Can be switched between standard, micro, and nano sizes. Product Packaging: SIM card, SIM pin, multilingual manual (English language not guaranteed)
Compatible devices: Compatible with SIM-free iPhones/smartphones, Wi-Fi routers, tablets, 4G and LTE-compatible computers Tethering is available Compatible devices: iPhones, iPads, smartphones, mobile Wi-Fi routers, tablets, LTE computers 【Supported Frequency Bands】4G/LTE: Band 1 (2.1GHz) / Band 3 (1.8GHz) / Band 19 (800MHz) / Band 21 (1.5GHz) / Band 28 (700MHz) / Band 42 (3.5GHz); 3G/W-CDMA: Band 1 (2.1GHz) / Band 6 (800MHz) / Band 19 (800MHz)

￥2,980
08

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
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

[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
09

ＤＸＨＵＢ

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【Docomo Line】180 Days 10GB 5G/4G/LTE Compatible Prepaid SIM for Japan Domestic Use, Data Only, Physical SIM, High Capacity, Compatible with Sim-Free Devices, 3in1 (Standard/Micro/Nano Multi-Compatible
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

【Proactive multilingual customer support】(Japanese, English, Chinese, Vietnamese) We accept various inquiries
【Free upgrade from 4G・LTE to 5G possible! 】 With JP SMART SIM's prepaid physical SIM, you can now add the [5G communication option] for free For those who have the revised new edition setup manual: After logging into the customer-only page, simply click on "5G Communication Option" to easily add it For those who have the first edition setup manual: Please contact our customer support We will apply the 5G option individually
※Please note that the activation period for the SIM card is indicated on the activation sticker If activated by the expiration date, you can use the purchased plan period without any issues
※In case of temporarily large amounts of data communication, we may control the communication speed from the perspective of fair use
Compatible with various devices: Can be used with SIM-free devices such as Android and iOS (iPhone, iPad-SIM model), or Docomo SIM-locked devices (smartphones/Wi-Fi routers/tablets, etc.) (SIM adapter / SIM pin included)

￥1,970
10

accfe

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プリペイドSIM 日本 10GB 大容量ソフトバンクプリペイドSIMカード日本国内用 SIMカード Softbank Prepaid SIM プリペイドデータ専用 4GLTE対応 japan (tfn-sim-10g)
8.4

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

Prepaid SIM Japan Soft Bank 10 GB Japanese SIM Card Prepaid SIM Card Prepaid SIM Prepaid SIM Prepaid for Data Only 4G LTE Compatible with Japan Contract Not Required, Easy Large Capacity APN Setting Required
Expiration Date: 12/05. The expiration date is written in the instruction manual (English language not guaranteed). No Limit of Usage Days: With the SIM expiration date, you can use the high speed data capacity up to 10 GB. Utilizing SoftBank's circuits for stable area and speed and tethering. Limit on Daily Communication Rate: You can use unlimited data capacity limits. *Limit to the maximum SIM card data communication
4G LTE Compatible Bands: Band 1 (2,100 MHz), Band 3 (1,700 MHz), Band 8 (900 MHz), Band 41 (2,500 MHz), WCDMA (3G) Compatible Band1 (2,100 MHz), Band 8 (900 MHz)
(Safety Desk in 3 Languages) 24/7 support window, not only Japanese but also English/Chinese. (Japanese support 9:00 to 18:00 on weekdays) in Japanese, English, Chinese
(Safe Softbank Communication) Compatible with Soft Bank, 4G LTE. *Prepaid SIM card is a SIM free (unlocked SIM) smartphone or tablet. Not compatible with SIM locked devices. The transmission speed may vary depending on the device used. For those other than LTE areas, it can communicate with 3G. Softbank Line Softbank Line Softbank

￥2,356

10 Best sim cards in 日本

Japan Prepaid SIM 360Days 50GB Large Capacity Rakuten 5G 4G LTE Compatible Prepaid SIM Card for Japan Domestic Use Rakuten Prepaid SIM Prepaid Data Only (360 Days 50GB)

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

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)

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

Nippon SIM for Japan Prepaid Sim Card, 180 Days, 10 GB, Sim, Docomo Communication Network, For Data Communication, 4G, LTE, 3-in-1 (Standard/Micro/Nano), Sim Free, Compatible with Devices Only

Nippon SIM for Japan Prepaid Sim Card, 180 Days, 15 GB Sim, Docomo Communication Network, For Data Communication, 4G LTE 3-in-1 (Standard/Micro/Nano), Sim Free, Compatible with Devices Only

[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

【Docomo Line】180 Days 10GB 5G/4G/LTE Compatible Prepaid SIM for Japan Domestic Use, Data Only, Physical SIM, High Capacity, Compatible with Sim-Free Devices, 3in1 (Standard/Micro/Nano Multi-Compatible

プリペイドSIM 日本 10GB 大容量 ソフトバンク プリペイドSIMカード 日本国内用 SIMカード Softbank Prepaid SIM プリペイド データ専用 4GLTE対応 japan (tfn-sim-10g)

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プリペイドSIM 日本 10GB 大容量ソフトバンクプリペイドSIMカード日本国内用 SIMカード Softbank Prepaid SIM プリペイドデータ専用 4GLTE対応 japan (tfn-sim-10g)