Yes. You can upgrade or downgrade your plan when your needs for features change.
There is a $15 for each account downgrade. The fee for an account upgrade will always be the difference between the setup fee of the new plan, and the setup fee of the former plan. (Sometimes this will result in a $0 charge, if the setup fees are the same.)
To request an upgrade or downgrade today, please email accounting@webii.net with your domain name and the details of the changes. All plan change requests must be submitted in writing by the authorized account contact person.