I need to run a VoIP calls services in which customers can download the app, purchase a plan, and make a real VoIP to phone number calls. You can take a case study from [login to view URL], [login to view URL], etc.
The application will be in both iOs, Android and web platforms. Payment gateways can be Paypal, Perfect Money, WebMoney, BTC, and local reselling services.
Any developer who knows something about this should pm me, I would like to see a demo of an existing project if there's any to compare between the functions.