Write an iPhone application

Hi I want to make Cloning for an existing App like = > (Viber) with some modifications So the App will have these features:- 1- Free texting & exchanging pictures between users. 2- Free voice or phone calling between users. 3- Free video calling between users. 4- First registration by Facebook account or E mail and the App will have access to Facebook friends. 5- To activate & Open the App user must give 5 stars rating :-) We can just open the chat feature after downloading the App Then tell the User to enjoy the FULL Version of our App and make Phone Calls We Need your Support By Giving Us 5 Stars Rating. 6- The App will generate revenues like (Viber) by (A) The user can buy credit to make international phone calls to landline or cell phones worldwide. (B) All advertising platforms like Google Adsense & Videos ======================= And I will exclude these features from the App 1) No History for Chat or Messaging = > ( all messages & calls will be deleted after 5 minutes ) 2) No Group Calls 3) No Group Text 8- The App will generate revenues like (Viber) by (A) Selling prepaid credit for international calls (B) All advertising platforms like Google Adsense & Videos