After taking the 536196 enhacement "Phone number from a guest customer in ecommerce orders do not migrate to Sales Orders", the customer phone number is migrated to SO for all guest customer. It is not the same bahavior for a customer who sign in with their account.

It would make sense to get the same information on the SO, whether if the customer is registered or not. With this, all the phone number information could be review in the same form.