I need an iPhone/Android app. I would like it designed and built.
I need a phone application that once installed on your device, doesn't allow the receiving of calls from numbers that you don't have in your contacts list.
When you get a call from a number you don't have in your contacts list, the app should automaticaly give a busy tone or send it to voicemail.
The app should be able to search for the number online(fb, twitter,etc) or in the shared contact list of other users of this app. Basically, you should get a notification saying you were called by that number that might belong to this person.
The app should gather all contacts from users, to which they agree when downloading it. (See the truecaller app)