Internet call not working on iOS 7 – KeKu International Calling App Review

I had the older app, compatible with iOS6 installed on an iPod Touch 4-th Gen. The app worked well for internet calls (to the contact's phone number) but would not allow the free call to other Keku app users. Now I have the latest Keku version in a new iPod Touch with iOS 7. The "free call" banner now appears next to the correct contacts. But the app doesn't work either for the regular internet call to a phone number, or for the free call to the contact's mobile device. Right now the only use I can get from Keku is via the local numbers, which takes away most of its attractiveness. Please fix the app.
Review by Rame.E on KeKu International Calling App.