Dual SIM lets one smartphone use two lines (e.g., physical SIM + eSIM) and switch them as needed—for better coverage and smarter savings both on the go and at home.
* A device compatible with the Rakuten network and Dual SIM is required.

🔎 What is Dual SIM?

It’s a feature that allows two lines (phone numbers/data lines) on one phone—for example, physical SIM + eSIM or eSIM + eSIM. You can set Line A for data and Line B for voice calls, or switch the data-preferred line when signal is weak.

* Behavior varies by device and Dual SIM mode (e.g., DSDS / DSDV / DSDA), including whether simultaneous standby or data during calls is supported. Check your device settings/manual.

💡 Practical use cases

• Backup during outages: If you combine different carriers, you can keep using the other line smoothly even when one suffers an outage.
• Separate work and personal: Split phone numbers and billing; manage contacts/notifications cleanly.
• Connectivity when traveling abroad: With Rakuten Mobile you can typically use service as is, no extra setup required. * Always confirm supported countries, terms, fees, and device roaming settings on the official site.

🛠️ Setup: 4 steps

Reference: Rakuten Mobile official “Dual SIM Guide” (Last checked: 2025-10-22)

• STEP 1: Check that your phone supports Dual SIM and the Rakuten network.
  
  Check device compatibility
  
  
• STEP 2: Apply to Rakuten Mobile (choose SIM card / eSIM).
  
  Plan details / Apply ／ See how to apply
  
  
• STEP 3: Add a SIM to your phone and configure switching between two lines.
  
  How to set up Dual eSIM
  
  
• STEP 4: Start using Dual SIM!

🎯 Application tips (fast & cost-smart)

• eSIM activation is quick—ideal for adding a sub line the same day.
  * If your device is not SIM-free, SIM lock removal is required.
• For the sub line, choose “Rakuten Saikyo Plan (Data Type)” to optimize monthly cost.

First, check device support, modes, and the application flow on the official site—then try adding a sub line (eSIM). It makes daily connectivity and budgeting much easier.

Related Articles