Login: Go to the web page https://my.iplum.com.
Change Number:
iPlum Portal || Accounts || Select Account or Sub-Account || 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.
Helpful links:
How to block any number from calling or texting my iPlum number?
How to setup iPlum business team account?
How to port my existing number to iPlum?