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English technical companion · checked 2026-08-08

J:COM MOBILE: How to Get an MNP Reservation Number

English guide to J:COM MOBILE: How to Get an MNP Reservation Number, including MNP One-Stop, reservation-number timing, conflicting procedures and the safest order to retry.

Updated: 2026-08-08Evidence: SolQvia structured records + primary-source links from the Japanese companion
On this page
  1. Summary / device record
  2. Diagnostic order
  3. Official sources

J:COM MOBILE: MNP procedure summary

ProviderJ:COM MOBILE
MNP One-StopSupported
Reservation-number timingSee the Japanese source record for the exact wording.
Primary methodSee the Japanese source record for the exact wording. Technical markers: MNP COM MOBILE COM.
Source check2026-08-08

Checks before requesting or retrying MNP

  • Do not run MNP One-Stop and the reservation-number method at the same time. Choose the method used by the destination application.
  • Check whether a reservation number is still being issued, already issued, expired, or waiting for reissue eligibility.

Recommended troubleshooting order

  1. Open the account page and confirm the exact line, contract type and account holder.
  2. Check whether another operation is pending: SIM/eSIM reissue, plan change, billing repair, identity verification or cancellation.
  3. Choose either MNP One-Stop or the reservation-number method based on the destination carrier's application flow.
  4. If using a reservation number, confirm issuance status, expiration date and whether a previous number is still active.
  5. Complete the destination-carrier application before performing a normal cancellation at the old provider.

When settings cannot fix the problem

If the line itself is not MNP-eligible, is a data-only/special contract, or requires a contract-type conversion, changing a phone setting will not solve the issue. Complete the provider-side procedure first.

Related English guides

Primary and official sources

Carrier procedures and product specifications can change. Re-check the current official page immediately before a SIM/eSIM migration, MNP request, purchase or imported-device use.