Android program for calls, so that contacts are stored separately?

Question

Android

Need a program or alternative way to store and access contacts.
Ideally, the program should show the incoming number and the name of the contact
Also make a call from the same program
But at the same time, other programs like WhatsApp did not have access to these contacts
Import from a vcf file

Or at least a convenient way to make a call from a file with a list of numbers

Answer 1

It's not entirely clear what your question is:

Need a program or alternative way to store and access contacts.

"Contacts" is an Android application, which, like any other, can be accessed by any other application.
You want to have your own application with password access to store personal data. Did I understand correctly?