SMSlisto is Betamax product and buying credits from SMSlisto entitles you to 90 Freedays. This means you can call all countries in the free destinations listed in SMSlisto website for 90 days at no costs. When the 90 days are over, you will keep your credit, and the normal rate will be charged for these destinations. You can get more Freedays by topping up your account with voip credit. Minutes of free calls are measured over the last 7 days and per unique IP address. When you run out of Freedays or limit is exceeded the normal rates apply. Buying less than 10 euros credit half freedays are given.
If your friends have the SMSlisto - software installed, you can also call all your online friends (peer-to-peer calls) as long as you like, for free. With Smslisto you can make *Unlimited Free Pc to Phone Call to 45 countries as well as send SMS.
*Unlimited = 300 minutes/week as per Betamax fair use policy :)
The most popular versions of this product among their users are: 4.1, 4.2 and 4.3