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You can now integrate this app with your own apps, documentation for that can be found here https://gist.github.com/4526851
The phone calls permission is required for Play Store licensing.
If you have any bugs or suggestions please head over to http://bugs.schoentoon.com or send me an email. If you have any crashes or freezes please use the built-in report option, this way you'll help me to make Twoons a better product.
The twitter account for all new regarding Twoons can be found at https://twitter.com/TwoonsApp
A free version of Twoons is available here