The following procedure can change your mobile phone number.
１．Tap the three main lines at the top right of the Myakupo app.
２．Tap "Registration Information" in "Account Management".
３．Log in with PIN code for payment or Face ID.
４．Tap "Change" of "Phone number".
５．Tap “Go to Change”.
６．Enter a new phone number.
７．Tap “Send SMS”.
８．Enter the authentication code received in SMS.
９．Tap “Certification”.
１０．Change of phone number is completed.