How do I change my Vumber
To change your Vumber, you will need to add a new Vumber to your account, and then delete an existing Vumber from your account. Note that the existing Vumber must have been on your account for more than 1 month (1 billing cycle)
1) First, add a new number to your account:
How do I add a new Vumber to my account?
2) Delete the number you want to replace.
How do I delete or remove a number from my account
If you add and delete in sequence like this, you will not be charged for an additional number at the time of billing.