간단 답변: Signing up for a SIM card online in Japan typically takes 15-30 minutes. You need your Residence Card (front and back photos), a Japanese credit card or bank account, and a selfie for eKYC verification. The SIM card usually arrives in 1-3 business days, or you can activate instantly with eSIM.
Before You Start: Prepare These Documents
- Residence Card (在留カード) — Your primary identity document. You'll need clear photos of both front and back. Make sure the card is not expired and the address is current.
- Payment method — Japanese credit card, debit card, or bank account (varies by carrier). Some carriers like GTN Mobile accept international credit cards.
- Phone that is SIM-unlocked — If you purchased your phone from another carrier (in Japan or abroad), ensure it is SIM-unlocked. Phones purchased SIM-free or directly from manufacturers (Apple Store, Google Store) are already unlocked.
- Email address — For account registration and receiving your contract details.
단계별 안내: The Universal Online Sign-Up Process
Step 1: Choose Your Carrier and Plan
Visit the carrier's website (see our ranking guide for recommendations). Select your plan and whether you want a physical SIM or eSIM. Choose "new number" (新規契約) if this is your first Japanese SIM, or "MNP" if transferring an existing Japanese number.
Step 2: Enter Personal Information
Fill in your name (as it appears on your Residence Card), address, date of birth, and contact information. Some carriers require the name in katakana — use a name converter tool or your My Number Card if unsure of the katakana reading.
Step 3: Upload Identity Documents
Take clear photos of your Residence Card — both front and back. Ensure:
- All text and numbers are clearly readable
- No glare or shadows obscuring information
- The entire card is visible (no cropped edges)
- The photo on the card is visible
Step 4: eKYC Identity Verification
Most carriers now use "eKYC" (electronic Know Your Customer) — a real-time video verification process:
- Hold your Residence Card next to your face for a selfie photo
- Tilt the card at angles to prove it's a physical card (not a printed copy)
- Follow on-screen instructions (turn left, turn right, blink, etc.)
This process takes 2-5 minutes. If it fails, try with better lighting and a plain background.
Step 5: Select Payment Method
Enter your credit card details or bank account information. For bank account autopay (口座振替), you may need to complete a separate bank verification step.
Step 6: Confirm and Submit
Review your application details carefully. Once submitted, you'll receive a confirmation email. Processing typically takes a few hours to one business day.
Step 7: Receive and Activate
Physical SIM: Delivered to your registered address in 1-3 business days. Insert the SIM card, configure APN settings (instructions included), and restart your phone.
eSIM: Receive a QR code via email or in the carrier's app. Scan it in your phone's Settings → Cellular → Add eSIM. Activation is typically immediate.
Common Rejection Reasons and How to Avoid Them
| Rejection Reason | How to Fix |
|---|---|
| Residence Card photo unclear | Retake in bright, even lighting against a plain background |
| Name mismatch | Enter your name exactly as printed on the Residence Card |
| Address mismatch | Use the address on the back of your Residence Card (registered address) |
| Expired Residence Card | Renew your card at Immigration before applying |
| Unsupported payment method | Use a Japanese credit card or check if the carrier accepts your card type |
| eKYC selfie failed | Remove glasses/hat, use good lighting, follow tilt instructions carefully |
Q: Can I sign up for a SIM card before I have a Residence Card?
Generally, no. Most carriers require a Residence Card for identity verification. If you are a short-term visitor or waiting for your card, consider a prepaid tourist SIM available at airports and electronics stores — these typically don't require a Residence Card but have limited validity.
Q: How long does it take from application to using the SIM?
With eSIM: as fast as 30 minutes to a few hours after application approval. With physical SIM: typically 1-3 business days for delivery after approval. In-store sign-up can be same-day.
Q: What are APN settings and how do I configure them?
APN (Access Point Name) settings tell your phone how to connect to the carrier's network. Each carrier provides specific APN settings — usually included in the SIM package or on their website. On iPhone, you may need to install a "carrier profile." On Android, enter the settings manually in Settings → Network → Mobile Network → APN.
면책 조항: The sign-up process may vary by carrier. This guide describes the general flow common to most Japanese mobile carriers. Please refer to your chosen carrier's official instructions for specific steps.
