It is easy to update your billing information such as Company address or Credit card details.
Go to the billing page:
Log into your Mobile Plan Portal as an admin.
Press "My Company" in the left menu.
Press billing in the top menu.
Update credit card:
Press "+Add payment method".
Add your credit card information.
Press "Add" to save the information.
Update billing address:
Press "Update information"
Add the information.
Press "Save" to save the information.