I'm looking to develop a mobile application using Android as IOS that support the following features :
1- Records all I/O GSM calls.
2- Records all I/O VoIP calls.
3- Show history log for both indexed by type (GSM/VoIP). where VoIP could be whatsapp, Viber..
4- Users can search any mobile number and return related info about if available like TrueCaller (I'll provide the needed API's).
5- User can white list and activate a feature for a set of mobile numbers, if they called a number of times with no response, the app shoot an alert SMS back to the caller mentioning the Geo-location of the handset.
The mentioned features will be separated by free and premium