Application Permissions
An application uses permissions to access telephony, and also optional permissions to access contacts, memory (SD-card) and "Do Not Disturb" mode.
Telephony
Used for blocking incoming calls.
Incoming caller ID, date, and time of incoming call can be sent to the server for analysis. Other data, such as an incoming caller's name, is never sent to the server.
The phone number and other information that can identify the client are never sent to the server.
Contacts
Used only for visual design and the ability to use contacts as blocking exceptions.
Contacts are never sent to the server and are not processed. All contacts information is only used on your device.
Memory (SD-card read/write access)
Used for importing and exporting black & white lists.
"Do Not Disturb" Mode
Uses on devices with Android 6 and higher to disable sound and vibration while checking incoming numbers.