Login: Go to the web page https://my.iplum.com.
Accounts || Click iPlum Login ID of the User || Change Number.
Choose the new iPlum number in subsequent screens. Once completed you will have a new iPlum number. If you don’t see the new number immediately reflected in the iPlum app, simply logout of the app & log back in. There is a one-time $4.99 fees to change the number.