With OnSIP you have the ability to choose the 'Per Seat Metered' plan or the 'Pay as you go' plan.
If you decide that you want a different plan for your account, you can change it at your pleasure.
Step 1: Navigate to the "Account" tab and click on the "Configure plans" link located under the "Plans" heading.
Step 2: From the drop-down choose either the 'Per Seat Metered' plan or the 'Pay as you go' plan. The resulting invoice will show you the change to your monthly charges.
Step 3: Once satisfied with your choice, click on the "Save" link at the bottom corner of the page to save your changes. You will see the package name change under the "Packages" heading on the left side of the screen.
Please keep in mind that when you select a package to subscribe to, your credit card will not be immediately charged for the amount shown. OnSIP is a monthly subscription service, and your credit card will be charged on the monthly anniversary of the date that you signed up. Changing your plan in the middle of your service month will only change the amount that will be charged at the next billing cycle for your account.