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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.

How the process works

Submit Request

Mobile NP under numbering rules; MIC guidelines encourage/require portability fees generally waived; fixed: bilateral portability between fixed providers from Jan 2025 with MIC guidelines.

Technical Switch

The migration is overseen by MIC (Ministry of Internal Affairs and Communications) using the .

Service Benchmarks

Mobile Timing

Downtime

Minimal

Market Intel

Coverage Scope Mobile (since 2006); fixed-line geographic numbers (0ABJ) bilateral portability introduced Jan 2025

Regulator MIC (Ministry of Internal Affairs and Communications)

Consumer Fees Mobile portability fees generally waived (per legal commentary)

Major Networks

NTT Docomo

KDDI (au)

SoftBank

Rakuten Mobile

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Expert Guidance

Fixed-line portability expansion is recent (Jan 2025); validate number-type scope (e.g., 0ABJ) and operator processes for enterprise/multi-number ports.

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 introduced 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 .