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eSIM in Japan: The Fastest Way to Get a Number (Rakuten Mobile Guide)

Complete guide to getting connected fast with Rakuten Mobile eSIM. All-online setup with ~3 minute activation using eKYC verification. Perfect for international visitors and residents.

2 min read377 words
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Last verified: August 14, 2025 (JST)

If speed matters, eSIM is the easiest way to get connected with Rakuten Mobile. There's no plastic card; just apply, verify, and activate on your phone.

Why eSIM?

  • All-online setup: Apply → verify identity → activate, no store visit. See the eSIM page.
  • Very fast activation: Rakuten highlights "Start using in ~3 minutes" once your eKYC screening completes on an eSIM-compatible device (details and conditions on the eSIM page and the Online Application Guide).
  • Dual-SIM convenience: Keep your home-country number while adding a Japan line; see the Dual SIM section on the SIM products page.

Apply with referral benefits → https://www.japanmobileguide.com/referral

What to prepare

  • Check your phone first: Use the official compatibility checker and note the warning that some overseas units may have limitations.
  • Have accepted ID ready: Foreign residents can use a Residence Card or Special Permanent Resident Certificate for eKYC; full list: Identity verification documents.
  • Payment method: Set up credit card or bank account; see reminders in the Step-by-Step Guide.

How activation actually works (5 steps)

  1. Apply online and select eSIM: Online Application Guide.
  2. Choose eKYC (AI quick verification) and capture your ID + face: Identity verification (eKYC).
  3. Enter payment details (card/bank): Step-by-Step Guide.
  4. Install the eSIM via my Rakuten Mobile when screening completes: SIM/eSIM product page (activation links).
  5. Finish initial setup for your device using the guides linked from the SIM/eSIM pages: eSIM page.

Pro tips for foreigners

  • Match your ID exactly. If your name appears in multiple scripts, follow the identity page guidance to avoid re-verification: ID page.
  • Overseas models caution. Rakuten notes some devices purchased abroad may not fully work even if listed; verify on the BYOD checker.
  • Fallback to physical SIM if needed. If eSIM installation isn't supported on your device, you can choose a SIM card instead; see pros/cons in the Online Application Guide.

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