You may want to keep using the smartphone or tablet you brought from abroad, but not all devices are compatible with every Japanese carrier. To use your own device with Rakuten Mobile, there are two main things you need to check. This guide explains how to verify “SIM locks” and “frequency bands” in a way that is easy to understand, even for beginners.

1. Can I use an overseas device with Rakuten Mobile?

Many smartphones and tablets purchased overseas can be used with Rakuten Mobile. However, your device must meet the following two conditions:

• The device must be SIM-unlocked.
• The device must be compatible with Rakuten Mobile’s frequency bands.

2. Checkpoint ①: Is the device SIM-unlocked?

A “SIM lock” is a restriction placed by a carrier that prevents the device from being used with other providers. If your device is SIM-locked, it will not work with a Rakuten Mobile SIM card. Please check with your original carrier or the device manufacturer’s support website to ensure that the “SIM Unlock” process has been completed.

3. Checkpoint ②: Are the frequency bands compatible?

“Bands” are the radio frequencies that your smartphone uses to communicate. Rakuten Mobile primarily uses two types of bands:

• Band 3: Rakuten Mobile’s own high-speed network. Your device must support this for an optimal experience.
• Band 18 / 26: The “Partner Line” (au network). This allows you to stay connected in areas where Rakuten’s own network coverage is limited.

4. How to check if your device is compatible

The most reliable way to check compatibility is to use the “Product Compatibility Check” tool on the official Rakuten Mobile website.

Rakuten Mobile Official: Product Compatibility Check Page

From the link above, select your product category (Apple / Android Smartphone / Tablet / Mobile Router / PC) and search for your specific model. If it is listed as compatible, you can use it with confidence.

5. Checklist if you still cannot connect

If your device is compatible but you still cannot connect to the internet, your “APN settings” may be incorrect. APN settings act as the gateway for your phone to connect to the network. Please refer to the “APN Setup” guide on the official Rakuten Mobile website and enter the required values in your device’s network settings.

Summary: Start by checking the official website

The first step to using your overseas device is to check its compatibility on the official website. Even if your device is not on the list, it may still work if it is SIM-unlocked and supports the necessary bands. Start by checking if your device can connect to Rakuten Mobile’s network.

*Information is current as of September 2026. Please check the official Rakuten Mobile website for the latest compatibility status.

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