How to make a fack caller app? I want to make a fack caller apps

Question

The number can be changed by calling the app. It can be talked online even with it.
Is it possible to create? How can it be made?

Answer 1

1. Fake is correct :D
2. You can learn from open source application like below link
https://github.com/zolamk/fake-call-lollipop

Answer 2

RexProg Thanks..

But how I create or made fack caller?
please saying me.