MNP stands for Mobile Number Portability. It allows you to transfer your existing phone number to another service provider.
You can request an MNP reservation number from your current provider (such as Docomo, au, or Softbank) and use it to keep the same phone number when signing up for our service.
MNP numbers are valid for 14 days after issuance.
We require that the MNP number has at least 8 days of remaining validity before expiration when you sign up with us.
MNP request pages for major providers can be found below:
Request MNP number from Docomo
Request MNP number from Au (Japanese only)
Request MNP number from Softbank (Japanese only)
If you wish to switch from us to another provider, we can also issue an MNP number for you.
LINK: I want to request an MNP (For Credit card/Smart Pit payment)