Admins have the option to charge customers who want to reactivate their old Mailbox numbers. This way customers can choose to keep their old numbers (for a fee) or have a completely new mailbox number.
To change the fee amount for users to keep their old private mailbox numbers (PMB):
1. Go to the Settings icon located on your top task bar
2.Then, under the Settings header, click on Plans
3. Scroll down to the option, Retrieve old PMB#, and under the appropriate plan, type the amount that you will charge.