I need to make chatting app that is including voice , video chat.
And also need to integrate facebook.
This app will support single and group chat features.
You might to refer Viber app in playstore.
23 freelancer menawar dengan rata-rata $1084 untuk pekerjaan ini
I will help you in making your application with features that you required plus i will help you in some extra modification like voice recognization of users to fullfil their data and information.