How to make python-kivy send all phone book data?

Question

Kivy

I decided to create the application "Parental Control" purely in order to gain experience. And everything was going well for me, until I thought about how to make sure that all the phone book data was transferred to a separate file, so that it would then be sent. Or the file itself in which contacts are stored was copied, transferred and then sent. how to solve my problem? as well as how to perform similar actions with SMS and a list of phone calls.