OpenClosed Lite

In the small version see the features offered by the application but with limitations.
To know what a complete version, visit this address.

https://play.google.com/store/apps/details?id=com.openclosed.openclosed&feature=more_from_developer#?t=W251bGwsMSwyLDEwMiwiY29tLm9wZW5jbG9zZWQub3BlbmNsb3NlZCJd

The lite version has only limited control over 20 phonebook contacts.
It lists the numbers not on the agenda as job category.
Do not execute the function block everything.
Not block the hidden numbers.