It's important to note that the products we offer do not support international roaming (i.e. our products can only function within Japan).
For details of the networks we use in Japan and the frequencies supported by our current product range, please refer to the relevant guide below -
Voice+Data SIM Cards
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The primary 4G frequency used by this network is:
4G Band 1 – 2100MHz
It’s vital that your device supports this frequency as this will provide network coverage in most major locations. We would therefore recommend using a device that supports this frequency at the very least.
However, this network also supports the following additional frequencies:
4G Band 3 – 1800MHz
4G Band 8 – 900MHz
The “4G Band 3 – 1800MHz” frequency is also commonly used in major areas (such as Tokyo, Nagoya and Osaka) and the “4G Band 8 – 900MHz” frequency can offer improved network coverage in mountainous regions / inside buildings etc.
For the best possible network coverage, we would recommend using a device that supports the primary frequency we first mentioned (the “4G Band 1 – 2100MHz” frequency) in addition to as many of the other frequencies shown above as possible.
Voice+Data eSIMs
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Our Voice+Data eSIM products utilize the Docomo network.
The primary 3G/4G frequencies this network currently uses within Japan are as follows:
3G Band 1 – 2100MHz
4G Band 1 – 2100MHz
We would therefore recommend using a device that supports these 3G and 4G frequencies at minimum.
However, this network also supports the following additional frequencies:
3G Band 6 – 800MHz
3G Band 19 – 800MHz
4G Band 3 – 1800MHz
4G Band 19 – 800MHz
4G Band 21 – 1500MHz
The 3G Band 6 frequency and the 3G/4G Band 19 frequencies can offer improved network coverage in mountainous regions / inside buildings etc.
If your device supports the 4G Band 21 frequency (in addition to the 4G Band 3 frequency), you may also receive improved cellular data coverage in some cities.
For the best possible coverage, we would recommend using a device that supports the primary frequencies we first mentioned (the 3G and 4G Band 1 – 2100MHz frequency) in addition to as many of the other frequencies shown above as possible.
Important Note:
On March 31st 2026, the Docomo network intends to shutdown their 3G service. After the shutdown, this eSIM product will only allow access to the 4G / LTE network and calls will only be possible via VoLTE. In preparation for this change, it would be best to choose a 4G compatible device (that supports the 4G frequencies mentioned above) and to choose a device that supports the VoLTE calling feature.
Voice Lite SIM Cards / eSIMs
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Our Voice Lite SIM Card / eSIM products utilize the Softbank network.
The primary 4G frequency used by this network is:
4G Band 1 – 2100MHz
It’s vital that your device supports this frequency as this will provide network coverage in most major locations. We would therefore recommend using a device that supports this frequency at the very least.
However, this network also supports the following additional frequencies:
4G Band 3 – 1800MHz
4G Band 8 – 900MHz
The “4G Band 3 – 1800MHz” frequency is also commonly used in major areas (such as Tokyo, Nagoya and Osaka) and the “4G Band 8 – 900MHz” frequency can offer improved network coverage in mountainous regions / inside buildings etc.
For the best possible network coverage, we would recommend using a device that supports the primary frequency we first mentioned (the “4G Band 1 – 2100MHz” frequency) in addition to as many of the other frequencies shown above as possible.
Data-Only SIM Cards
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Our physical Data-Only SIM Card products utilize the Docomo network.
The primary 3G/4G frequencies used within Japan by this network are as follows:
3G Band 1 – 2100MHz
4G Band 1 – 2100MHz
We would therefore recommend using a device that supports these 3G and 4G frequencies at minimum.
However, this network also supports the following additional frequencies:
3G Band 6 – 800MHz
3G Band 19 – 800MHz
4G Band 3 – 1800MHz
4G Band 19 – 800MHz
4G Band 21 – 1500MHz
The 3G Band 6 frequency and the 3G/4G Band 19 frequencies can offer improved network coverage in mountainous regions / inside buildings etc.
If your device supports the 4G Band 21 frequency (in addition to the 4G Band 3 frequency), you may also receive improved cellular data coverage in some cities.
For the best possible coverage, we would recommend using a device that supports the primary frequencies we first mentioned (the 3G and 4G Band 1 – 2100MHz frequency) in addition to as many of the other frequencies shown above as possible.
5G Unlimited Data-Only eSIMs
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Our 5G Unlimited Data-Only eSIM products utilize the KDDI AU network.
The primary 5G/4G frequencies used by this network are as follows:
4G Band 1 - 2100MHz (Primary Frequency)
4G Band 18 - 800MHz (Primary Frequency)
4G Band 26 - 800MHz (Primary Frequency)
4G Band 3 - 1700MHz
4G Band 28 - 700MHz
4G Band 11 - 1500MHz
4G Band 41 - 2500MHz
4G Band 42 - 3500MHz
5G Band N28 - 700MHz (Primary Frequency)
5G Band N3 - 1700MHz (Primary Frequency)
5G Band N77 - 3500-4000MHz (Primary Frequency)
5G Band N78 - 3500-3700MHz (Primary Frequency)
5G Band N41 - 2500MHz
5G Band N257 - 28000MHz
For the best possible coverage, we would recommend using a device that supports the primary frequencies in addition to as many of the other frequencies shown above as possible.
4G Data-Only eSIMs
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Our 4G Data-Only eSIM products utilize the Docomo network.
The primary 3G/4G frequencies used within Japan by this network are as follows:
3G Band 1 – 2100MHz
4G Band 1 – 2100MHz
We would therefore recommend using a device that supports these 3G and 4G frequencies at minimum.
However, this network also supports the following additional frequencies:
3G Band 6 – 800MHz
3G Band 19 – 800MHz
4G Band 3 – 1800MHz
4G Band 19 – 800MHz
4G Band 21 – 1500MHz
The 3G Band 6 frequency and the 3G/4G Band 19 frequencies can offer improved network coverage in mountainous regions / inside buildings etc.
If your device supports the 4G Band 21 frequency (in addition to the 4G Band 3 frequency), you may also receive improved cellular data coverage in some cities.
For the best possible coverage, we would recommend using a device that supports the primary frequencies we first mentioned (the 3G and 4G Band 1 – 2100MHz frequency) in addition to as many of the other frequencies shown above as possible.
Important Note:
On March 31st 2026, the Docomo network intends to shutdown their 3G service. After the shutdown, this eSIM product will only allow access to the 4G / LTE network and so in preparation for this change, it would be best to choose a 4G compatible device (that supports the 4G frequencies mentioned above).
WiFi Devices
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The WiFi devices we offer support a range of frequencies and can connect to multiple networks in Japan.
These devices can connect to the Softbank network, the Docomo network, the AU network and the Rakuten network.
Please note that it will not be possible to select a specific network as these devices are configured to automatically connect to the best network that’s available at the time.
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