Rule is a set of conditions that contain filters for incoming calls.
No, the application works offline. There’s no need for Internet connection.
Find details in "Tutorial" tab.
You don’t need to add information manually when installing the app on another device as all data is transferred via the linked accounts.
It is possible to connect several social networks to keep your data safe, but you can untie your backup using Disconnect button. Logout in its turn is used to switch off linked social accounts.
According to the international standard, the phone number can't start from '0'. The system will automatically delete zero if it was entered.