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Port your number in Japan

Looking to switch carriers in Japan? This guide covers the essential regulations and procedures for keeping your number while moving between NTT Docomo, KDDI (au), SoftBank and Rakuten Mobile.

Technical Porting Process

1

Authorization & Submission

Mobile: MNP Reservation Number from donor, then to recipient; Fixed: bilateral switch between NTT and others from Jan 2025

2

Centralized Validation

The migration is overseen by MIC (Ministry of Internal Affairs and Communications) using the to ensure integrity between donor and recipient networks.

Regulatory Benchmarks

Mobile Porting SLA

Mobile: typically immediate/same-day after reservation number provided

Max Service Outage

Minimal

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Expert Guidance

Fixed-line bilateral portability (Jan 2025) is a major update for Japan's fixed market; previously NTT-only numbers were locked.

Common Questions

Is number porting possible in Japan?
Yes, Japan currently has Y status for number portability, covering Mobile (since 2006); fixed-line geographic numbers (0ABJ) bilateral portability enabled Jan 2025 services.
How long will I be without service during the switch?
The maximum allowed service interruption is typically , with the total process usually taking Mobile: typically immediate/same-day after reservation number provided.

Verified Intelligence Sources