The Concept of the app was made to help the people to make video as well as audio calls on devices which does not support volte services but this app is quite buggy in many sense . even after several update this app is very buggy and sluggish. this app hangs a lot and in my experience it has made me annoyed to make even a voice call . the app does not work when you most need it like when you want to make a voice call and it does not even connect same goes for the video call . at one instance I was trying to call my friend who also uses the same app to make a call but he was not able to call me and I was not able to call him . the layout and the design of this app is very basic and which is quite good in many ways but a slight improvement is needed, as far as the feature is concerned the app has basic normal function which help in making voice and video call but it is not good because of the sluggish nature . the app is only slightly useful as it hangs a lot and it cannot change your permanent phone dialer . so I would not recommend to use this