You have contacts that you want to hide, or simply protect from your children who may unwittingly cancel.
In a simple and fast way "Private Phonebook" saves your contacts protecting them with a password.
There are three fields: Name; Number; Note; all to be completed.
At the first access password field empty; set your password.
If you forget the password all data will be lost, for further security there is no way to recover it, not even for the developer. Uninstall the program and start from the beginning.