In a review over at DSL Reports, a customer mentions a "pay as you go" plan:

"Update August 1, 2010

.... Tim of Voipo was very responsive and honest in his assessment of what was best for my needs. After speaking with him on the Voipo Forums (great idea) I have decided to go BYOD and pay as you go, ...."

I'm only seeing monthly and annual plans on the signup page. Where would I sign up for such a plan?

Thanks.