The app has been designed really good. Only parts not taken care of are the app functionality and UX itself! At starting it asks to transfer old credits to so called upgraded account but it gets an error - Failed! Then you keep on searching where are the options to recharge or do the stuff. Its very badly hidden. Go to favourites and u get a + button. It would have been better if the app focuses on functionality first then on stuff like button animation. Then I go to feedback option to write a feedback but as soon as you tap it the app crashes because mail app is not configured. Come On its heights!