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Tool / IMEI Checker

Check red-flag IMEI risk before erase starts

The MASAMUNE IMEI checker helps confirm network restriction status across docomo, au, SoftBank, Rakuten Mobile, and mineo. It is useful as a pre-erase and pre-resale decision step for used smartphone workflows.

Run Free Check View Mobile Edition
5Japan carriers
5/dayfree unregistered checks
300/dayafter registration
Cloudfits the operation path

Best-fit teams

  • Used phone resale, buyback, and trade-in operators
  • Teams trying to avoid restricted devices entering the erase queue
  • Organizations that want IMEI decision-making close to erase operations

What to know first

Reference toolFinal confirmation should still be made on the carrier side.
Usage limits5 checks/day without registration, 300/day after free registration.
Workflow linkThe checker fits the same operational model as Mobile Edition.
Best use: This tool is most valuable when used as part of a resale or erase-intake workflow, not only as a standalone free lookup.

Avoid restricted inventory

Identify high-risk devices before more work is invested in them.

Support resale judgment

Check network restriction status before erase and reconditioning work begins.

Five-carrier coverage

Check the main Japanese carrier group in one public interface.

Connect to operations

The logic fits the same operational path as MASAMUNE Mobile Edition.

Results are reference information. Final confirmation should be done on the official carrier side.

You can find the IMEI in the device settings or by dialing *#06#.

Entered IMEIs are used only for this check and are not stored. IP addresses may be logged temporarily for abuse prevention.

What network restriction means

A restricted IMEI, often referred to as a “red-ROM” device in Japan, is a handset flagged by the carrier. Common causes include unpaid device balance, theft reporting, insurance replacement, or contract violations.

StatusMeaningOperational reading
○No restrictionSafer to move into resale or erase prep
×RestrictedReview purchase or resale decision
△Unable to confirmRetry or confirm directly with the carrier

Used phone resale

Filter out high-risk devices earlier in the intake or appraisal workflow.

Trade-in and buyback

Decide where to invest erase and reconditioning time before work starts.

Operational continuity

Connect IMEI decision-making with the same operational model used by Mobile Edition.

Need IMEI checks inside a larger operating flow?

If you need this tied to higher-throughput erase operations, Mobile Edition is the right next step.

View Mobile Edition Discuss Operations