If you have changed your phone number, you can update your iPlum Login ID to match with it.
Login to secure online portal https://my.iplum.com.
You are now logged into your iPlum account.
Select “Profile” and click the edit icon next to iPlum ID (same as Login-ID), Caller ID Name or Email. If you don’t see the options, just refresh the page. When you are changing the iPlum ID, the system will send you a verification code on the new phone number which you are setting as iPlum ID.